RO/DI Question

[epleeds]

I'm running a 90 gallon spectra pure maxcap 90 and it's only averaging 2.5 GPH when it should be at least 3.5 to 3.75. I'm running a booster pump at 70psi and my TDS is at 4 coming out. I am planning on replacing all 4 catridges this weekend but was wondering if the cold temps could have something to do with the low production. Or is it something else I'm not thinking about. The membranne is 5-6 months old.

[zygote2k]

I'm running a 90 gallon spectra pure maxcap 90 and it's only averaging 2.5 GPH when it should be at least 3.5 to 3.75. I'm running a booster pump at 70psi and my TDS is at 4 coming out. I am planning on replacing all 4 catridges this weekend but was wondering if the cold temps could have something to do with the low production. Or is it something else I'm not thinking about. The membranne is 5-6 months old.

do you have the proper size flow restrictor?

[hypertech]

It's probably the water temp. The rating is based on a particular temperature 70F I think. If your water is colder than that it will be slower.

[Coral Hind]

I would replace the filters other then the RO membrane and then check as it could be clogged pre-filters. Is the unit close to the tap valve? Long runs of the 1/4" line can slow the flow.

[Origami]

The top right graph in the data sheet found here (click on the data sheet link found to the right and look on page 2) for one of the most popular 75 gpd membranes we use, the Dow TW30-1812-75, shows production approximately halved as the water temperature drops from 75 degrees F to 50 degrees F. Temperature could be the issue, but it could also be clogged pre-filters or pressure drop through long runs of tubing. I tend to lean toward the cold water explanation myself.

[smallreef]

Yeah Im going with cold water here too, last week when it was REALLY cold my water coming out of my cold water tap was only 62 degrees... that cut my output to 2 gph... when its 70 i get 3-3.5 gph...

[epleeds]

Thanks for the info. I will change out my filters this week.