There is no need for chemical products to battle nutrient levels. The cure may be worse and do more damage as the nutrient levels ever will. A nutrient level does not kill, unavailability does. In a lot of cases, one does not know what is added exactly. Phoshate E is no exception.
Basic: Determine phosphate concentration in aquarium prior to first use by testing with an accurate test kit. Add product to aquarium near a mechanical filter or protein skimmer intake at the maximum rate of 5 ml (1 capful) per 20 US-gallons daily for each 1 ppm of phosphate present in system. When used in this fashion, 250 ml treats up to 1,000 US-gallons (3,785 L). Add weekly
at same dosage to maintain
an immeasurable reactive phosphate concentration.
I would rather not be that coral that is growing at an increasing rate due to an increasing temperature supported by nutrient availability and suddenly is cut off of its phosphorus source for a prolonged period of time. On a weekly base?
It is good husbandry to try to avoid phosphorus becomes the growth limiting factor, this shock therapy seems to me not a safe method to manage the phosphorus reserve. It is not good husbandry adding products to a live support system of which one does not know what they contain and how they work, exactly.
I have no doubt Phosphate E is very effective for removing phosphate, but? Once added one does not have any control over the removal rate which is basic for being able to manage the nutrient content. Removing is not the same as managing.
If for example a ferric based phosphate remover is used in a filter or refuge, one is able to manage the removal rate, this way controlling the reserve at the desired level.
But there are other and better ways to manage the nutrient content.
Why battling phosphorus? Do you have any scientific references backing up the need for battling the phosphate content, and kill the messenger as it was the only enemy to kill to win the war?
All I could find is that an increased phosphate level support calcification if enough CO3 is available and the phosphate level does not influence the symbiodinium growth rate much, exempt if not available.(
ref: CMF De Haes En Co 2017-2020) It has been shown insufficient availability of phosphorus in periods of high growth harms and may kill corals. (
ref:Anthias2019) Limiting the risk for coral bleaching is the least what one can do. I think using Phosphate E is not the best way to limit that risk.
For safe and easy nutrient management we make use of a simple biofilter, a refuge.