Why is there foam in my hot tub?
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Sources of white foaming may include (but are not limited to) a build up soap film, detergents, cosmetics, deodorants, etc. Brown or tan foaming needs to be removed as its organic contaminants build up and can cause issues.
Sometimes water chemistry in a hot tub, such as high pH and/or low Total Hardness, can cause foaming. Test strips or a water analysis from your local pool store can help determine if one of these are the cause of the issue.