Brown Slime


Well-known member
Jan 4, 2016
I have a standalone spa and noticed I am getting a brown slime forming all over the handles and on the bottom of the cover. This is only happening in areas outside of the water. Anyone know what the cause is (I have read High PH) and how to get rid of it and prevent it from happening again? Hot tub does not get used often right now but when I check PH it is always in line and bromine is good (Although it dropped to 1) once when I forgot about it.


TFP Expert
Platinum Supporter
May 23, 2015
Tucson, AZ
It's probably mold growing from the humidity under the cover. I'd remove the cover and sanitize with a mild bleach spray. Then, you should open the cover on a regular basis to let the humidity out.

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TFP Expert
Mar 2, 2011
Could be organics, body oils etc that cause foam. The foam can create sticky goo.

Do you get much foam?