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I use a bag of phosguard (I think it’s rated for 100g?) and just leave it in my media basket 24/7. I’ve had zero issues and my phosphates test pretty consistently in an optimum range. (.03 last time I checked) I also feed consistently and heavily, so I think possibly that balances out with what the phosguard is doing. I just wash it off under hot tap water every few days, (then a rinse in Aquafina water to make sure I’m not putting chlorine back in the tank!) it will last quite a long time for me.
how are your nitrates?