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Old 05-24-2011, 02:01 AM   #1
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What's this residue in my saltwater storage drum?

I have a 55 gallon food safe storage drum that I keep my mixed saltwater in for water changes. The water comes from my RO/DI filter and I use Instant Ocean Reef Crystal salt mix. I have a circulation pump and a heater in there that keeps the water at 80 degrees.

After a few weeks, I notice a pasty cream color residue that covers the pump and the walls of the drum. Is it mildew? Is it something I should be worried about? My coral and fish don't seem to be affected by my water changes.

The drum can be sealed air tight, however I have one of the bung holes open to feed the power cords into it.

I've attached a photo if it helps. Thanks for your help!
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Old 05-24-2011, 08:22 AM   #2
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It's probably calcium carbonate and magnesium. Nothing to worry about and it's quite common.

What is that Precipitate in My Reef Aquarium? by Randy Holmes-Farley - Reefkeeping.com
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