Where we mention HTH Spa 86135 Non Chlorine Shock Oxidizer, Spa & Hot Tub Chemical, 2.25 lbs

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

  Best MPS shock (oxidizes body oils without raising chlorine) · Best for: Weekly shock after heavy use. MPS (potassium monopersulfate) oxidizes body oils, sweat, and bather waste without raising combined chlorines. Pair with the enzyme — enzyme breaks down oils, MPS oxidizes the broken-down residue.

• Hot Tub Water Care Basics: A First-Year Owner's Checklist

  Weekly MPS shock (default) · Best for: Non-chlorine oxidizer that breaks bromamines without driving free sanitizer high enough to damage acrylic.

• Spa vs Pool Chemistry: 7 Differences That Matter (2026 Guide)

  Weekly MPS non-chlorine shock · Best for: Weekly non-chlorine oxidizer that breaks down bather waste without raising FC high enough to damage acrylic shells.