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thank you that was the answer I was looking for , very helpful to me . thanks againI really like Phosphate Rx as a product. I also alway run carbon. I have never removed the carbon from the sump and the Phosrx is still very effective. Could be more effective without the carbon. Not sure if packaging directions instructs otherwise.
I’m not sure what the active ingredient is. Sounds like lanthium chloride. The bound up phosphate can clog the pores in your carbon. I would run some sort of filter (like a sock) before the carbon