When I used the reef crystals my buildup was a beige/tan color. I would see it also as a film in top of the water and when I added it into my five gallon jugs it looked like dust floating all through it. After adding to the tank of course it would clear up. It wasn't because it was not mixed well. I mix my SW
for a minimum of 24 hours and usually it will be constantly mixing for 3-5 days before use. I had to constantly clean my powerhead and the container I kept it in. That is why I switched to the Salinity. I have yet to see the film or suspended particles with the Salinity but the old container I was using still was cacked with the Reef Crystals residue. I just started mixing my SW
in s new container about three weeks ago and so far no residue, film, or dustlike particles. It will be interesting to see if it forms or stays clean. At a minimum at least I don't get that SW
that looks like dust is suspended in it.