IO Reef Crystal Question

[Cal_stir]

Originally Posted by lastlight

My RC sludge is red/brown and pretty nasty.

I was using IO without a problem (a bit of ca buildup over time), then I switched to H2Ocean and got the nasty red-brown film in my container and it spread to my sand bed, I then switched to Reefcrystals and now I'm back to the same as the regular IO.

I have a 20 gal mixing container, I add 4 cups of salt at a time and let it mix at least 1 hour before adding more. If you add the salt too fast the stuff will precipitate out.