RO Membrane Question - Page 2

StirCrazy · #11 11-15-2003, 12:48 AM

Quote:

Originally Posted by EmilyB

water pressure is 42psi, but it's always been that way. Flow restrictor? I don't think I've ever seen it or taken it out?

at 42 PSI a RO isn't going to work very good at all. my 100 GPD unit used to fill up my top off bucket in 3.5 hours from empty with 100PSI, the other day when I did it with 42PSI it took me 2 days

so you can see how much it slows down if you are aproching the 40PSI minimum.

ok on your waist water line there should be a insert that limits the flow of waist water. this will give you the back pressure you need to make the membrain work properly. do you have a flush valve? if so if you look at it it will look like a loop with a valve that you can open to flush your membrain, usaly this is taken off befor and after the flow restrictor.

If this is confusing take a couple pics of the tubing and I will try see how it is set up.

Steve

Veng68 · #12 11-21-2003, 12:02 AM

did you ever figure it out Deb?

Cheers,
Victor

EmilyB · #13 11-21-2003, 01:41 AM

I did a 30 minute backflush and I have some flow now. I guess it is probably as good as I can get in the winter with 42psi and the cold water.

golden69_ca · #14 11-21-2003, 02:40 AM

you have a cloged membrain which you proved by backflushing it . how old is your ro . on the water machines i work on we get about a year out of a membrain . you can get allittle more life if you leave if on a back flush for a couple days . it is recomended to back flush them every couple weeks to prolong lifespan .

StirCrazy · #15 11-21-2003, 03:31 AM

Quote:

Originally Posted by golden69_ca

you have a cloged membrain which you proved by backflushing it .

She also has very cold water and only 42 PSI which means only about 20% of the rated flow.

Steve

Veng68 · #16 11-21-2003, 08:24 PM

Quote:

Originally Posted by golden69_ca

you have a cloged membrain which you proved by backflushing it . how old is your ro . on the water machines i work on we get about a year out of a membrain . you can get allittle more life if you leave if on a back flush for a couple days . it is recomended to back flush them every couple weeks to prolong lifespan .

I notice that you are in the lower mainland........ how does the RO membrane clog within a year around here since our water has a very lower TDS?

Cheers,
Vic

Aquattro · #17 11-21-2003, 08:28 PM

Vic, it's very difficult to gauge clogging in time. A lot depends on how many gallons you process. I go thru 40g/week with my unit and it's about 1.5 years old. Our TDS is fairly low here, but we have a lot of algae. I go thru prefilters like crazy

EmilyB · #18 11-22-2003, 12:44 AM

I guess then the fact that the membrane

is probably a year old, and I run double or more what Brad runs, I probably need a new one soon.

golden69_ca · #19 11-22-2003, 03:51 AM

the membraine will also catch organics . i know where the bad water sorces are in the lowermainland and trust me there are some bad areas that you would not think of .

mnoll406 · #20 11-22-2003, 10:21 PM

Hey Guys,
Actually 42 PSI is not that low. I have a 50GPD, and my inlet is only about 42psi. I fill a 8 gal bucket in a couple of hours. I do flush the unit for 5-10 min before I use it, and do longer run lengths (ie 8 gallons) every time I do it.

Mike