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?