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- May 17, 2018
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My fritz has never stained any container or left residue. That's one reason I switched to it. Also, I've never had it cake up but I use an open lid container so I dont need a funnel. My corals look better now then when I used IO. Maybe you got a weird batch. Idk.I’ve been using the Fritz RPM blue box the past couple of months and I’ll say I’m not that impressed. The synthetic salt seems to brown stain my mixing jugs and cakes real bad on my funnel and scooper. Corals seem meh and fading in color. After this 200 gallon box I’m switching back to Red Sea Blue Bucket. May be worth it if you start a tank using it but imho it’s not good for my 3 year established tank.