Poly-Bio-Marine----Polyfilter - Holmes-Farley

[Randy Holmes-Farley]

Yes, because foods and possibly chemical additives bring in copper every day, more than is being consumed.

 

[Ferdy]

I know this is a VERY old thread, but I have a concern that may be able to be addressed. Does Poly-Filter absorb/adsorb iron? The reason I ask is being able to determine if Poly-Filter defeats the purpose of using GFO for phosphate removal. Hopefully someone can answer this for me...I read the ASTM lab testing, and from what I gathered from that is, that, indeed, Poly-Filter does absorb/adsorb iron, which is what granular ferric oxide is. Thanks.

 

[bertoni]

GFO works as a solid medium, like activated carbon, so it'll be fine with a Poly Filter in the system. The vast bulk of the GFO does not dissolve, and truly dissolved iron probably isn't binding phosphate, so there will be no measurable effect.

 

[hottuna]

I know this is a VERY old thread, but I have a concern that may be able to be addressed. Does Poly-Filter absorb/adsorb iron? The reason I ask is being able to determine if Poly-Filter defeats the purpose of using GFO for phosphate removal. Hopefully someone can answer this for me...I read the ASTM lab testing, and from what I gathered from that is, that, indeed, Poly-Filter does absorb/adsorb iron, which is what granular ferric oxide is. Thanks.

Short answer: Yes it does absorb iron..but only down to NSW levels..not to zero. polyfilters are standardized using a salt mix that is very close to NSW values...
And contrary to what Holmes-Farley said : it does a very good job absorbing phosphates...