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500 ml will remove 3 ppm of phosphate and silicate from roughly 16.000 liters (4226 gallons) of fresh water or 8.000 liters (2113 gallons) of marine water.
Overdosing can cause a negative effect in your tank due to rapid removal of phosphate and chemistry changes. It is recommended to use a small amount and gradually increase the amount of PO4x4 used, while monitoring the phosphate levels in your aquarium.
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Follow up review - Going on Week 3 By FLSharkvictim on 5/17/2017FLSharkvictim would recommend this product to a friendI went back to my BRS reactor instead of the brand new Vertex 1.5L that I bought!!! Anyhow, i tested my p04 and it's currently testing out @ 0.02 which I could never get it that low! Many thanks BRS for selling this amazing product that truly does work if used it the proper way. Like I mentioned above, I started w/ only 50 mls and after the 2weeks I added another 50 mls! I have 100 mls in my BRS slightly tumbling and no more stuff or haze on the glass after 1 or 2 days of cleaning it. No Algae breakouts that I was having. Also, I was able to final get my po4 under 0.03 and with the HC GFO that was not happening.
Superior By FLSharkvictim on 4/29/2017FLSharkvictim would recommend this product to a friendWOW, this stuff works absolutely amazing and will never use any other kind on the market.
I could not get my PO4 under 0.06 on my Phosphate Ultra Low Hanna Checker for the life of me until I started using this! I have only been tumbling for a few about 7 days and already my P04 is @ 0.03. HIGHLY recommend if you're having problems lowering your Phosphates. BEWARE THIS PRODUCT IS VERY VERY STRONG. I use a Vertex 1.5L media reactor and I only started out with 50mls. Week # 2 I will add another 50 mls which will be then a total of 100mls and test from there.
Awesome By James on 2/5/2017James would recommend this product to a friendI don't understand why this is not the top go to product for p04 removal. It doesn't grind, it is somewhat regenerable all be it troublesome. It is at least 4X as effective from my experience as GFO. It rinses clean immediately, and Its cost effective. I don't even consider other options for p04 removal. In fact its so good you have to use very small amounts or you'll over strip the water and shock your system. Up flow reactor is the best way to use it i think.