Kolar Labs GFO Bayoxide E33 Phosphate Remover – for Freshwater and Saltwater Aquariums, Reef Tanks, Promotes Coral Health, 454g

I’ve tried several brands of GFO over the years, and Kolar Labs’ Bayoxide E33 is easily one of the most consistent. It’s clean right out of the jar — very little dust after a quick rinse — and it doesn’t clump or break down like some cheaper versions. I’m running it in a reactor on my 150-gallon reef tank, and it keeps my phosphate levels stable around 0.03–0.05 ppm. I noticed clearer water within a few days and no negative effect on corals. What I like most is how long it lasts before needing replacement — easily 6–8 weeks depending on bioload. Pro tip: rinse lightly with RO water before use, and use a slow tumble in your reactor to avoid grinding it down. If you’re serious about keeping algae under control and your colors crisp, this GFO is worth every penny.

I tested my saltwater phosphate. It was 0.06.. a week before installing this product. Tested this week. Phosphate is 0.03. I like where it's going now.

Did what its supposed to do! Dropped them phosphates like it was hot!

Water sorting application.

Works great.