Has anyone used this product ??

[Randy Holmes-Farley Verified Community Expert]

Well I am certainly not a chemist...lol.
I can only go by how my tank and corals look and what my testers tell me.
Im sure i will use polyfilter when they have it again at my lfs, but this seems to be at least a solid product so far.
And i have no interest or affiliation to the product, just something i tried because they were out of what i wanted.

That's fine and as it should be, but nothing you have reported suggests that the material you are using binds phosphate itself.

The same effect of reducing nutrients can be attained by skimming, but there is no export of nitrate or phosphate by skimming either.

In both cases, any effect is from export of organics.

 

[Key-tie]

That is not true in surface seawater or on coral reefs, where it is often far lower.

The value you quote would imply pollution (eutrophication). Note that 0.1-0.2 uM mentioned below is 10 to 20 ug/L, or 0.01 to 0.02 ppm phosphate.

Eutrophication and coral reefs—some examples in the Great Barrier Reef lagoon

Eutrophication or “nuisance” algal growth causes negative impacts on coral reefs via a number of routes and can eventually lead to the replacement of …

www.sciencedirect.com

Eutrophication and coral reefs—some examples in the Great Barrier Reef lagoon​

"The concentrations of nutrients N and P associated with the onset eutrophication in coral reef communities are less well defined (annual mean DIN ∼ 1 μM; P-PO4 ∼ 0.1–0.2 μM) but are in accord with eutrophication threshold levels for sensitive freshwater ecosystems."

I actually read a great article, I believe from University of California that said that phosphate ocean levels change higher and lower with depth.
Was truly interesting.
If I can figure out how to post it, I will.
And just an fyi to all, I'm not here to battle anyone or prove anything, just to absorb knowledge and be helpful if I can.

That's fine and as it should be, but nothing you have reported suggests that the material you are using binds phosphate itself.

The same effect of reducing nutrients can be attained by skimming, but there is no export of nitrate or phosphate by skimming either.

In both cases, any effect is from export of organics.

And that may very well be the case...
As I said, I can only go by what my visuals and my testers tell me.

 

[Randy Holmes-Farley Verified Community Expert]

I actually read a great article, I believe from University of California that said that phosphate ocean levels change higher and lower with depth.

Yes, they do. Much higher in the deep ocean. At the surface, photosynthetic organisms suck it up and drive the concentration way down.

 

[Key-tie]

I tried to post the link, because it was an interesting article, but it wont open when i put up the link.