RODI Phos

[ctreptow]

I've been fighting a terrible hair Algea outbreak for the past 6 months. My phos has been steady at .15 and I couldn't figure out where it was coming from. Last night for some reason I tested the topoff water in my storage tank and go figure, phos at .15. I tested the water coming out of the RODI system and again .15, So is this a membrane problem?

 

The ro system is only 1.5 years old and I replaced all filters except the membrane about 2 months ago.

 

Chris

[dandy7200]

What filter array are you using?

[ctreptow]

My System is the Aquasafe 100Gpd

 

The setup is inbound through carbon > Micron Filter > Polish Filter I think > Membrane > to Pressure Tanks.

 

From Pressure Tanks through the taste and odor > DI to Holding tank for fish tank.

 

I tested the water right from the membrane and I get the same .15 there as well

 

Chris

 

What filter array are you using?

[dandy7200]

I would go ahead and buy a filmtec 75gpd membrane and swap it out.

 

You really should go: Sediment > 5 micron carbon > 0.5 micron carbon > DI > second DI if you can then rotate DI for max life.

[ctreptow]

The membrane inside is a Filmtec I am just suprised it seemed to go so fast.

 

I did order a replacement membrane to see if that helps. I will also feed the storage tanks straight from the membane and cut out the pressure tank storage.

 

Are you saying I should DI prior to the membrane and then again before the storage tanks?

 

Chris

 

I would go ahead and buy a filmtec 75gpd membrane and swap it out.

 

You really should go: Sediment > 5 micron carbon > 0.5 micron carbon > DI > second DI if you can then rotate DI for max life.

[dandy7200]

The membrane is probably not bad just the wrong rating for reef application. 75gpd is the standard not 100gpd. DI > DI is best then to starage tank. Then when #1 is exhausted put #2 in it's place and reflill #2. This gives you the longest life from the resin. Initially it cost more but, in the long run is cheaper.