BioGuard 22947BIO | Smart Shock -1 lb 12 PackCheckout the ScaleTec Plus Pool Descaler now available BioGuard Smart Shock 1 lb 12 Pack. Weekly use of Smart Shock keeps the water crystal blue and sparkling. It oxidizes organic contaminants that cause cloudy water, musty odors and eye irritation. It also kills bacteria and algae; it also clarifies the water using a filter enhancer. Smart Shock buffers the pH to provide brilliantly clear water with no cloudy residue and without increasing the pH.