Hmmm, good question. I use ChemiPure, and use double the recommended without issue so far. In fact, I have been commenting that my tank is doing better. Not necessarily due to the chemipure, but you never know.
So I would state in my case, it is fine.
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Setup: 180G DT, 105G Refuge (approx. 300lbs LR, 150lbs Aragonite)
Hardware: Super Reef Octopus SSS-3000, Tunze ATO, Mag 18 return, 2x MP40W, 2X Koralia 4's Wavemaker
Lighting: 5ft Hamilton Belize Sun (2x250W MH, 2X80W T5HO)
Type of Aquarium: mixed reef (SPS & LPS) with fish
Dosing: Mg, Ca, Alk
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