RO unit NEEDS HELP
 

Bought an Aquasafe unit while back, had always had back yield 1-2 gpd. Rated for 100gph. Any suggestions.

hooked up correctly, pre-filters need changing (what's the flow like after them), membrane shot, AVOS working, check valve okay, flush valve correct position? Check section by section.

http://i67.photobucket.com/albums/h316/das75/ro-1.jpg

Definitely sounds like something is hooked up incorrectly.

On an unrelated note: I don't know if that schematic is of the unit in question but if it is keep in mind that the post-carbon will add TDS back into the water after it's been brought down to 0 by the DI.

RO membrane could be bad. Recent ones from aquasafe have had faulty RO membranes. I've installed two bad ones this year, in both cases the system would only produce a minute amount of water each day, after checking everything I replaced the membrane and it fixed the problem.

is this a typo or is it realy rated for 100gph? that would be 2400gpd

and is the yield 1-2 gpd or gph?

ok so asuming that it is a 100gpd unit and you are getting 1-2gph would mean your getting about 25 to 50 gpd.

first thing, what is your water PSI and temp? with out knowing these we can only make guesses.

Steve

I assumed he meant 1-2 gpd, with 100gpd membrane, 50 gpd wouldn't be that bad and wouldn't indicate a problem, except that the water pressure is a little low.

sorry, its a typo. 1-2 gpd on a good day. Water is from ground. Now that aquasafe is out of business, does anyone know were i can get more membrane?

what is AVOS mark.

AquaSafe is now back in business with a new web site ordering here. Also, you may order membrane replacement from bulk reef supplies.

Cheers!

I think he meant ASOV (Automatic Shut Off Valve)... Shuts unit off automatically when resevoir is full or back pressure is high enough.

AVOS, that's the Weather stations we put on ships. Too many acronyms.

Yes meant ASOV

and if you do need to order a membrane, seems the 75g might be the better deal.

see here

So, i should buy a 70 gpd? Are all membrane universal? do i need to buy a flow restrictor also? is a pump booster a good idea also?

Yes, buy 75 gpd membrane and restrictor. Restrictor is the key to keep flow at rated level for the membrane. Booster pump is a good idea if the pressure of your water supply is not adequate. I would start without it, save some $$$ :biggrin:. Measure the production level of your setup and see how far behind gpd you are.

who is best place to buy from at decent deal? bulk reef? how is there shipping cost?

make sure when you buy a membrain you buy one that the rating is at 65psi. there were a lot of companies ripping people off a few years back by selling membrains by the 100psi rating, of which most people don't have 100 psi so you would buy a "75gpd" membrain and the most you would get out of it was 25 to 45 depending on water temp, as it was realy a 45/75 membrain. I know dow filmtec is one of the best ones out there and most others are just relabled filmtecs. dow used to lable there products TW30-1812-75/100 for example. the 75 would be the 65psi rating and the 100 would be the 90psi rating. from reading there site they have redesigned there membrains so the same filter is only labled as TW30-1812-75. when looking at the new specs it is impressive, the 75 is at 50 PSI now and instead of 120 being the max operating psi it is now 150psi. and at 100 PSI this filter now puts out 150gpd.

also remember temp real affects output. a water temp of 77 degrees gives you rated output but a water temp of 50 degrees will only give you about 48gpd instead of 75gpd.


Steve

Some membranes from other manufacturers may fit, we have a limited supply, bring your old one in and we can see if we can match one up for you.

Ken

hi ken,
think i can bring my membrane in to get tested?