Champion Pool Shock Liquid Chlorine 12.5 Sodium Hypochlorite, 1 Gal 4-Pack | Ready-to-Use with No Mixing, Non-Staining and Non-Scaling, for Clear Water & Algae Control in Above Ground & Inground Pools

We live in the south (GA) so we don’t have to winterize the pool for a hard freeze. For our in-ground salt pool over the winter months, I clean the pool and filters and backwash the sand filter and then install a safety cover. I install a bypass insert in place of the salt generator. Then one day a month I add a gallon of Pool Shock Chlorinator and run the pump for 24 hours. This keeps any algae growth in check over the winter months. When we open the pool in spring, the water only requires minimal chemical treatment after salt has been added. Easy and cost effective way to keep water chemistry healthy while pool is covered. (While only running the pump once per month, I make sure that the water lines are purged before re-starting pump).

Will never use another shock brand again! Easy to use, does the job amazingly well!! Getting it delivered is great as well as I have a hard time getting heavy stuff through the store to the car and out to the pool!

Good product

Great....did it's job raising chlorine levels on opening the pool. Easy to use. Was able to swim in 6 hours.

It works fine, but too pricey. The chlorine I buy from my local Pool Supply store is less expensive and works just as well.

I put this in my system. Two bottles last me about a month.

Easy to use, and great bang for your buck. Cleans the pool very well.

Used it twice so far and my reading is zero chlorine. Put in powder shock that I had, and now my pool is reading there is chlorine in the pool.