Where we mention In The Swim Chlorine-Free Pool Shock — 12 x 1 Pound Bags

• How to Choose Pool Shock: Cal-Hypo vs Dichlor

  MPS routine oxidizer · Best for: Routine oxidation when the owner wants to avoid adding chlorine or CYA; not a substitute for sanitizer when FC is low.

• Pool Eye and Skin Irritation: Causes and Water-Chemistry Fixes

  Best non-chlorine shock · Best for: MPS oxidizer for combined chlorine without raising free chlorine.