New 300 Gpd Ro System Problems

[Don Kee]

The likelihood is your water pressure is too low mate, membranes (most) need a decent water pressure to run at a decent capacity...

Id recommend getting a pressure gauge if you dont already have one and fit it just before the inlet to your r.o.

If your pressure is less than 50 which it normally is, you'll need a booster pump. It'll bring down your tds and speed up production no end

 

[David Taylor]

Another problem may be, if these 3 membranes are run inline ie waste goes from one to the other to the other with only one waste outlet, the tds will increase into each following membrane so what starts at 510ppm will be more into the second and even more into the 3rd.

you then will probably have 3 RO outlets meeting at one point, the first may be reading 10ppm

the second is using waste water from the first so the tds will be higher going into it and may be reading 20ppm

the third will be using waste water from the second membrane with an even higher tds and may be reading 30ppm

the final tds you get will be an average of the 3 outlets so in this case 60/3 = 20ppm.

A good way to test your rejection rates on each membrane would be to hook them up individually, other wise you are just guessing what the problem is.

 

[David Taylor]

So if you can, the way to get the purist water from a 3 membrane system is to have them parallel ie run them individually.

Run water through the pre filters then split into 3 and have those entering the membrane, then have 3 RO outs and 3 waste outs

Me personally, I would sell the 3 x 100gpd membranes and buy a single 300gpd membrane

 

[utdfederation]

just checked the water from the tap and the TDS reading is = 560 ppm

 

[David Taylor]

just checked the water from the tap and the TDS reading is = 560 ppm

and your best ro out put reading? 62? works out to about 89% rejection

 

[utdfederation]

so is that good?

 

[utdfederation]

so to sumerise if i buy a booster pump this will indeed better the results?

 

[David Taylor]

so is that good?

not for a new system, you should be looking at trying to get 98% which would give you 11.2ppm
anythin above 95 would be handy then you`d be looking at 28ppm

 

[David Taylor]

so to sumerise if i buy a booster pump this will indeed better the results?

easy answer yes.
but if i was to bother doing this i`d rather spend my money on a better membrane

 

[Smurf]

What 560 ppm /emoticons/ohmy.png May I ask where do you live to have tds reading that high

just checked the water from the tap and the TDS reading is = 560 ppm

 

[utdfederation]

worcester Smurf

 

[utdfederation]

gotta love seven trent eh?

 

[Smurf]

Think maybe you are in the wrong game as you should consider selling water softeners instead

 

[xline]

this pump would work a treat £65 plus vat, it would come with the relivant fittings to connect to your sytem.

View attachment 1439

 

[doug atkinson]

Alarm bells start ringing 560 ppm unsafe water, but more like dodgy TDS meter unless you are on well water not mains.

Your R/O I would have not set it up that way

 

[Smurf]

I've just spoken with a chap from Worcester and his mains tap water tds reading is around 280 ppm.