Where we mention HTH Spa 86116 Defoamer, Spa & Hot Tub Chemical Eliminates Foaming, Soft & Silky Water, 16 oz

• Foamy Pool Water and Hot Tub Foam: Causes, Fixes, and Prevention

  Spa-specific defoamer · Best for: Post-shock foam on a 350-gal hot tub at 1-2 oz doses, gentler on acrylic shells

• Hot Tub Foam: Causes, Quick Fixes, and When to Drain & Refill

  Best standard hot-tub defoamer · Best for: Quick knockdown when jets turn on and the foam builds immediately. 16 oz bottle treats a 250-500 gal hot tub 6-10 times at the standard dose (a capful). Doesn't fix the underlying cause, but it's the fastest way to get rid of visible foam before a guest arrives.