Bacteria ring around spa?


New member
Mar 7, 2021
Sacramento, CA
Anyone get a brown/grey/blackish film ringing just above waterline in acrylic fiberglass spa? I spa flushed twice, cleaned interior, new filter, and water is perfectly balanced, yet I still get it within days of refill. Ideas? Might this be caused by my cover too tight and not letting air circulate through? Is the bacteria/film further embedded in the plumbing of the spa?


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Mod Squad
LifeTime Supporter
Jan 17, 2012
Evans, Georgia
Hey ya Tim :) Welcome to TFP.

That's a scum line- skin cells, oils, hair and body products, etc. Get a good plastic scrubby sponge and wash it down. Its pretty normal.

Try to shower ahead of soaking to limit body lotions and such.

Maddie :flower:
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