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  1. #1
    toodkeng
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    Should I use a water filter or not?

    Hi guys

    I just want to pick anyones brains about water filters .. in my building i've had to install a new water tank ( 800L ) and a new water pump ( Mitsubishi WP-205Q3 ) because the mains pressure isnt enough to boost the water to the second floor where i'll be living .. i only need water for the washing machine, kitchen sink, shower, bathroom sink, bum gun and to fill the thai style toilet water flush bucket thingy

    so what i want to know is just a few simple things ;
    1. Do i need a filter of some sort between the mains water pipe and the tank because sometimes the water can be a bit yellow and i'd hate to start filling the tank up with unnecessary crap which in turn would surely get into the pump etc and slowly block the pipes over time.. the water isnt for drinking so i know i dont need the filters ive seen with three stages of purification etc .. i just want something to grab the fine dirt enough to keep atleast the washing machine water clean .. OR am i over worrying about the yellow water ?

    2. i've heard that most of the check valves in thailand never work anyway .. so is it worth adding them in the pipe line..hehe .. or whats the alternative ? or even a good brand that DOES work .. anyone know ??

    and finally ..
    3. i can't really read the instructions for this pump cos its all in thai .. but does it make much of a difference if i use 1'' pipe or 1/2'' between the tank and the pump? .. i have 1/2'' now but it can easily be changed .. and i have 1/2'' out of the pump going upstairs to all the outlets listed .. ie washing machine, shower etc .. cos i understand it will increase the pressure etc .. but will it be too much for the pump?

    this sounds clear enough to me to understand cos i already know what i mean .. but if i need to provide more details or pictures etc let me know

    Thanks for any help

  2. #2
    Have you got any cheese Thetyim's Avatar
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    Quote Originally Posted by toodkeng
    sometimes the water can be a bit yellow and i'd hate to start filling the tank up with unnecessary crap
    A simple filter will remove the yellow colour.
    The guy at Homemart called it a rope filter but don't know if this is the correct name for it

  3. #3
    Have you got any cheese Thetyim's Avatar
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    Quote Originally Posted by toodkeng
    but will it be too much for the pump?
    It will be no problem for the pump.

    The time you will notice the difference is when you have more than one faucet open.
    How many people live in your house ?

  4. #4
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    My filter is after the tank and the pump. The tank seems to catch the worst of the dirt,the rest gets stopped by the filter.That is the way the diagram that came with the pump and the filter shows it. I clean the tank out once a year or so.

  5. #5
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    Quote Originally Posted by toodkeng View Post

    so what i want to know is just a few simple things ;


    2. i've heard that most of the check valves in thailand never work anyway .. so is it worth adding them in the pipe line..hehe .. or whats the alternative ? or even a good brand that DOES work .. anyone know ??

    and finally ..
    3. i can't really read the instructions for this pump cos its all in thai .. but does it make much of a difference if i use 1'' pipe or 1/2'' between the tank and the pump? .. i have 1/2'' now but it can easily be changed .. and i have 1/2'' out of the pump going upstairs to all the outlets listed .. ie washing machine, shower etc .. cos i understand it will increase the pressure etc .. but will it be too much for the pump?


    Thanks for any help

    Optimum would PROBABLY be a 3/4 inch suction & a 1/2 inch discharge (which is already fitted). The current 1/2 inch suction might be perfectly OK.

    Check valve. Good ones are for sale at the hardware store. I posted a picture in another pump thread.

  6. #6
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    My water supply is is very dirty, I put 2 filter after the tank & pump.
    filter 1 I use filter media called BIRM to remove Metals from the water
    Filter 2 used Anthracite to take out the odder.

    The water is only for washing no drinking.

  7. #7
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    Here is what you are looking for. Often "Made in Italy" implies better quality then "Made in PRC".



    I don't have a good suggestion for a fliter. One of the things the storage tank does is allow settling. So solids will fall to the bottom & will not be pumped into your system.
    To remove the color you would need a filter, sand would be optimum.
    Barack Hussein Obama lying polecat. Libs Only Comply With Laws They Agree With.

  8. #8
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    This sweet filter was for sale at Home Work [at]Central Dept store. Great for well water etc. Have a valve system to reverse flush out solid debris.


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    If your water is only occasionally contaminated then a simple cartridge filter will suffice with the large size being the best choice. If contamination is frequent then you need a larger filter with backwash facility.
    The style posted by dotcom is a good choice and much easier to backwash than the traditional multi valve Thai hook-ups.

    Locate the filter between supply and tank; this leaves the house feed free from restriction.
    I suggest you avoid stores like HomePro for this equipment and use a specialist shop. You will get better prices and advice.

    Check valves in Thailand suffer because water is often contaminated especially when pulled from a well. The contaminants slowly build up on the seal and operating rod which eventually leads to failure or corrosion. Choose a quality valve and fit quick release couplings either side so that it can be inspected and cleaned periodically. Plastic quick release couplings are available from most brands but rarely used by the Thais because they donít think about tomorrow. Avoid check valves with ferrous components.

  10. #10
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    Follow up to my prev post.

    Small cartridge filter fitted with release couplings.



  11. #11
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    The style posted by dotcom is a good choice and much easier to backwash than the traditional multi valve Thai hook-ups.

    Locate the filter between supply and tank; this leaves the house feed free from restriction.
    I suggest you avoid stores like HomePro for this equipment and use a specialist shop. You will get better prices and advice.


    Mount the media filter before the tank you mite have a problem with the flow-rate
    For backwash the filter as it need 40 Lpm to clear properly
    So the better place a media filter is between the pump & tap.

  12. #12
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    Quote Originally Posted by toodkeng
    Do i need a filter of some sort between the mains water pipe and the tank because sometimes the water can be a bit yellow and i'd hate to start filling the tank up with unnecessary crap which in turn would surely get into the pump etc and slowly block the pipes over time
    why is the water yellow?

    is it sediment or iron salts or something else?

    that makes a difference to your filter choice

  13. #13
    Days Work Done! Norton's Avatar
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    Quote Originally Posted by Ratchaburi
    Locate the filter between supply and tank; this leaves the house feed free from restriction.
    I have this setup. Another advantage is the tank will require far less cleaning.

    Supply to filter, to 800 litre underground tank, to pump, to house.

    Filter material is activated carbon which does a good job removing smell and yellow color. Size is about 1.2 meter high x 25 cm cylinder. Valves on the filter allow for back flushing.

    Filters such as these can be purchased anywhere in Thailand.
    Whenever you find yourself on the side of the majority, it is time to pause and reflect.

  14. #14
    toodkeng
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    some great tips so far ..

    there will be only two of us living there ( me and the missus ), maybe the odd guest once in a blue moon but 99% of the time there wont be much of a problem with needing every outlet open at the same time .. we can pre fill a bowl of water for a shower if need be while the washing machine is on etc

    seems to be a mixed opinion about where the filters are best placed .. so .. i think to begin with i will try putting it between the supply and tank .. for two reasons
    1. even though the mains pressure is fairly low and may have some problems getting through the filter fast enough to fill the tank up etc.. there will only be the two of us and with an 800L tank it shouldn't cause much of a problem even if it takes half a day to fill back up ( touch wood it doesnt ) im not sure exactly how much water a washing machine uses though ( maybe 60-70 litres per wash?? ) .. so might need to fill a bowl or two up for shower water on washing days
    2. i don't know as yet how easy is it to clean out the pump, if the crap makes it out of the tank and into there .. i dont wanna have to buy a new pump any sooner than needed .. so prevention is better than cure i say

    BUT .. of course .. this can all be changed at anytime seeing as all my pipe work is completely external fitted to the walls ( not pretty but apart from the girls in thailand .. what is?? ) and cheap as chips to buy a new bit of pvc pipe to re-route it

    i'm not 100% sure what is causing the colouring .. theres some sediment in there , but might not be the only factor .. after the taps are run for a while it clears up usually .. but then appears again when they've been off a while ( this is why i'll stick to a small filter for now .. no point going overkill to begin with )

    thanks maxion and dotcom for the pictures .. i'll save those and take them with me to the shop .. that should make things a hell of a lot less painful when explaining what i want .. the quick release are a good idea, just hope i can find them .. its hard enough finding that type of filter around here .. maybe i'll need to go back into bkk for a look

    just one more thing .. how many check valves do you guys use ? .. just one after the pump ? or do you have one before the tank too?

  15. #15
    Days Work Done! Norton's Avatar
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    Quote Originally Posted by toodkeng
    how many check valves do you guys use ?
    There is one which is inside the pump to prevent water from running from the house back into the tank when the pump is off. The pump you intend to buy will have it as well.

    The tank I have is underground so it has a check valve near the inlet (suction) end of the tank pipe. The check valve came with the tank.

    If your tank and pump come with the check valves no need to install more.

    Quote Originally Posted by toodkeng
    there will only be the two of us and with an 800L tank it shouldn't cause much of a problem even if it takes half a day to fill back up
    Same situation I have. Have had the supply cut off for three days and only used about 400 liters so no need to worry about having enough water reserve with 800 liter tank.

    You will have to purchase a float valve similar to those in a toilet installed at the inlet pipe to the tank so when the tank is full the supply water is shut off.

  16. #16
    toodkeng
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    ahh ok .. thats good to know about the pump having one already

    i already have the ball valve ..my tank is above ground , its a great big 6-7 foot blue plastic monster standing in the corner of the building by the back door ..

    i live in a 3 storey town house (or will be when this is all finished , at the gf's parents house for the time being ) .. the ground floor will be a shop , 1st floor is where we will live and thats as far as the water will be going , and the 3rd floor will just be storage for now.. maybe a game room if i can get away with it ..lol

  17. #17
    Days Work Done! Norton's Avatar
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    The tank being above ground you will not need a check valve at the tank.

    You still should consider the larger filter but your call.

    Seems you have it sorted. Good luck.

  18. #18
    toodkeng
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    ahh yes .. that did come out the wrong way .. i intended to get the biggest filter .. but of the type that maxion showed in the photo ..if the one in his photo is the small one i was gonna get a larger one than that if possible .. but i think what i was trying to say is .. not quite as big as the backflush jobby for 12,500 baht that dotcom suggested .. atleast not yet

  19. #19
    Days Work Done! Norton's Avatar
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    Quote Originally Posted by toodkeng
    the type that maxion showed in the photo
    If you buy the smaller cartridge filter be sure to price the cost of replacement cartridges and average frequency of needed change. You may find the cost over a couple of years higher than the larger filters.

  20. #20
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    And just be sure to remember that Pipe thread here is a machine thread and not a tapered NPT, so it will bottom out and leak and Thai seem to think that just keep wrapping with teflon pipe tape until it fills the thread, but teflon has no blow out strength, so ain't for shit.

  21. #21
    toodkeng
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    very good point there .. i guess i'm already starting to think like a thai person ..lol.. not looking very far into the future there

    is there a huge difference ?... im not so fussed its less than £100 or so for a year or two but if your talking hundreds each year then im sold on the big one right now ..lol

    i guess this raises the question of how often does maxion change that small filter ? .. if my water is cleaner than his then i can change less often

    how much do the filters cost to replace ?
    and how much is it all to start with ?

    also .. does the big one that dotcom showed need filters or any other accessories ?

  22. #22
    Days Work Done! Norton's Avatar
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    Quote Originally Posted by toodkeng
    does the big one that dotcom showed need filters or any other accessories ?
    Carbon needs to be replaced over time. I have had mine for over three years and have yet to do so. Cost to replace carbon about 4,000 baht if I remember correctly.

    Have no idea of cartridge replacement costs. The only smaller cartridge filters I have seen are reverse osmosis used when folks want to drink tap water. About $50 every 6 months.

  23. #23
    toodkeng
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    Quote Originally Posted by blackgang View Post
    And just be sure to remember that Pipe thread here is a machine thread and not a tapered NPT, so it will bottom out and leak and Thai seem to think that just keep wrapping with teflon pipe tape until it fills the thread, but teflon has no blow out strength, so ain't for shit.
    without sounding to stupid ..where in the equation would i need to worry about this in particular ? are all the threaded joints weak spots ? or just certain ones ?

    i've already had to chisel the walls out to replace split pvc parts that had been forced to much with a tap that had to much ptfe tape on it .. the walls are like solid rock .. let alone removing tiles .. jeeeezzzz .. but i know what you mean .. this is why i've decided to install all the pipes and do as much decorating as i can myself .. i'm pretty DIY minded , worked with my old man for a while as he's a self employed builder, roofer, carpenter, general all round clever chauvanistic b'stard .. but i'm just not well versed at all the aspects and pitfalls of such a task .. so i'd rather come here ask a millions questions and do a bad job myself than pay someone else to do a bad job and then have a headache trying to figure out how to fix it .. atleast i might know where i went wrong to save time in the future..lol

  24. #24
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    Quote Originally Posted by Norton View Post
    Quote Originally Posted by toodkeng
    does the big one that dotcom showed need filters or any other accessories ?
    Carbon needs to be replaced over time. I have had mine for over three years and have yet to do so. Cost to replace carbon about 4,000 baht if I remember correctly.

    Have no idea of cartridge replacement costs. The only smaller cartridge filters I have seen are reverse osmosis used when folks want to drink tap water. About $50 every 6 months.

    From what I under stand that you have a activated carbon filter you have to
    Change every year .
    I think that it is Anthracite which is crushed coal it last for many years.
    Less water required for Back wash.
    With the filter that you buy you need a top screen so that when you backwash
    you do not lose the Antracite.

  25. #25
    Days Work Done! Norton's Avatar
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    Quote Originally Posted by Ratchaburi
    From what I under stand that you have a activated carbon filter you have to Change every year
    So say the carbon sales folks but my water is still smell and color free so won't change until the water quality indicates it needs to be changed. You make a good point, it may well be anthracite rather than the carbon as advertised.

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