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Prefilter water filter - dirty water coming into my home! (chiang mai)


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Posted (edited)

I live in an old condo block

The water coming in to all my taps is sometimes full of sediment (I suppose the water tank on the roof is old)

Is there such as thing as a prefilter just to remove the large sediment so my shower heads and taps dont get clogged up?

Like a big filter that connects to the blue pipes before it comes into my room from the hallway.

Where can I get such a filter and someone to install it please. I live in chiang mai city

Edited by CrossBones
Posted

Got mine at Global for around B900. I'm sure all the home improvement chain stores have them.

Can also order from LnwShop duan-daw.com

If you have ample access to your condos incoming supply pipe it's a pretty easy install with minimal tools.

20180225_075239.jpg

Posted

The inline filters such as the one shown above do work but the filters can be very expensive, a bigger more robust sediment filter is available from all Global House/Home Pro's etc but costs around 18k.

Posted

Yeah, we have one like r136dg with the polyester filter. Keeps the big crunchy bits out of the water tank and pump.

 The bigger versions have a better flow rate, but as simoh1490 notes, the replacement elements can be pricey.

Posted (edited)

I use a 30 micron filter on the inlet to the tank, it gets the larger solids out, any smaller sized filter and would have problems! been using the same filter for about 4 years, rinse it out monthly or when needed. The single cartridge filters are a reasonable price ~500 baht, as stated if you go to smaller filter sizes gets expensive and time consuming, keep the pump suction about 30cm off the bottom of the tank and flush tank every six months to get rid of the smaller particle build up.

Just noted OP is in a condo so not going to be practical! :saai:

Edited by CGW
  • 2 weeks later...
Posted

Bumping this one.

 

We have a couple of 1 m x 4 m surface standing, concrete well-pipe water storage tanks connected to the city water and ahead of the pressurized house water supply system. The natural settling of muck and sediments in these tanks before it is drawn into the house has coped for 12 years but the past month or so, the city water has been really murky and now the service point filters (drinking water) on the pressurized side are getting really dirty really fast.

So looking for a one-size-fits-all external water filtration system I can insert in the water main between the meter and the storage tanks. Nothing too high tech and something large enough that won't need too frequent backwashing and the like. If like in other places we have lived, the dirty water is a temporary thing due to them working on the water mains somewhere, then all well and good but nice to get something installed in case it's a bigger issue with dirtier water in the long run.

 

Since I now have 2 tanks with about 6,000 liters of murky water and typically low city water pressure, if I drain these and refill through the new mains filter, it will be a while before I have 'full service' since with a household up around 10, that's a lot of showers, laundry and cooking! So, I think I need to install a secondary filter on the outlet side of the water tanks and before the pressurized system? These can be installed with bypasses for filter changing on-the-fly.

 

I was thinking getting one of those 20" 'big blue' filters on the city side and a smaller 10" one on the tank outlet. Any ideas? Same size both sides (saves on stocking two filters sizes)? Clear body or blue body for easier sighting of dirty filters? How do these plastic bodies stand up to the sun?

 

Thanks,

NL

Posted

I would use two of the Big Blue type filters. You could use a finer filter element on the second unit but watch for it clogging if it's on the inlet side of the pump (it's better on the pressure side).

 

We have a clear filter, it's gone green inside (it's outside but not in direct sun), the blue ones are fine. 

Posted
Just now, Crossy said:

I would use two of the Big Blue type filters. You could use a finer filter element on the second unit but watch for it clogging if it's on the inlet side of the pump (it's better on the pressure side).

 

We have a clear filter, it's gone green inside (it's outside but not in direct sun), the blue ones are fine. 

Thanks Crossy. Not sure about putting the secondary filter on the pressurized side of the water pump. Trying to keep it relatively simple for when I am not at home and things need messing with. Every 6 weeks or so, the water pump starts fast-cycling and it's taken a few years of edumacation (and locking up my tools) to stop bro-in-law discarding springs from pressure switches. Now MiL is quite adept at the power-off, drain and purge routine.

 

Good point on the clear filter housings. Despite the water constantly moving, the 'slime' builds up and I read that's why (most) garden hoses are green... so you don't see the green slime inside. The blue filter bodies (and water tanks) are supposed to inhibit the uv and/or sunlight which encourages the slime to develop... or so I have been told.

Posted
53 minutes ago, NanLaew said:

Not sure about putting the secondary filter on the pressurized side of the water pump.

The problem with filters on the suction side is that if they clog it can cause the pump to cavitate, this can lead to rapid erosion of the impeller and consequent failure.

 

There's a lot more headroom on the pressure side.

 

  • 2 weeks later...
Posted
On 3/9/2018 at 5:21 PM, Crossy said:

The problem with filters on the suction side is that if they clog it can cause the pump to cavitate, this can lead to rapid erosion of the impeller and consequent failure.

 

There's a lot more headroom on the pressure side.

 

Good point... especially with any clogging likely to happen when I am off the premises and the BiL is in DIY mode!

 

Was looking at a couple of higher-end filters, one at HomePro and the other branded Steibel Eltron and being pitched at Ubon Watsadu. Both are the longer filter bodies and appear have bespoke, combination carbon and POE filters. Both cost a tad under 4000 baht incl. the filter element. Unfortunately, the HomePro guy couldn't tell me the cost of spare filters and the Watsadu guy said I would need to contact the supplier to get replacement filters. I opened up their display unit to see what the filter looked like and there wasn't one! I guess another customer talked another salesman into selling them the filter element from the display unit. A serious TiT moment.

Posted
7 hours ago, NanLaew said:

Unfortunately, the HomePro guy couldn't tell me the cost of spare filters and the Watsadu guy said I would need to contact the supplier to get replacement filters.

Expect them to be $$$. Not being able to supply replacement elements is an immediate turn off for me.

 

I would stick to particulate filters unless you absolutely need ion-exchange (water softening), then I would restrict it to point of use. Same with carbon, it makes the water taste nicer but has little effect on your washing machine.

 

  • Like 1
Posted

FWIW I have a 2k stone clad tank which then feeds into a Mazuma charcoal filter before feeding into the home. The stone clad tank is excellent at blocking light so algae growth is almost non-existent, a drain pipe at the bottom means it's easy to clean when needed. The Mazuma needs backflushing one every  couple of months and this is a 15 minutes job that's easily done, changing the charcoal filter material is not difficult and Mazuma will do it for a pricey 2k. I haven't yet drained the tank (4 years) because I haven't needed to, I suspect however there's a layer of sediment at the bottom - my backup plan if needed is to add a sediment filter on the supply side of the tank. If I had to do it all again I wouldn't do anything differently, it's a very effective system that's easy to maintain.

Posted

Thanks

I dont have access to any pumps. Its all coming from the tank on the roof of the condo building

I dont care about water softening. I Just want to stop my taps and shower head getting blocked up by sand size particles

 

I do have access to the pipe coming into my condo

What can I do (easy and cheap)

Posted
25 minutes ago, CrossBones said:

Thanks

I dont have access to any pumps. Its all coming from the tank on the roof of the condo building

I dont care about water softening. I Just want to stop my taps and shower head getting blocked up by sand size particles

 

I do have access to the pipe coming into my condo

What can I do (easy and cheap)

It's tough to do anything in a condo because as you say you don't have access to the source of the problem hence you're dealing with only short runs of pipe as they come out of the wall and the floor - been there, done that!

 

The solution for the kitchen is probably the easiest, you're more likely to be able to install an under counter filter of some sort which should be inexpensive and fairly easy to instal - as said earlier, be prepared to pay through the nose for filters.

 

The bathroom solution is more difficult and the only sensible option might be to install a shower head that has a filter in it, that means removing it and cleaning every so often, along with the screw on tap filters.

 

Failing those things, perhaps try putting some pressure on the condo. manager to instal a sediment filter at the source of the buildings water supply, they can be had for about 18K and are very effective.

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