Right now there are 203 deals from Amazon Resale, formerly Amazon Warehouse Deals, in Patio, Lawn & Garden › Pools, Hot Tubs & Supplies › Cleaning Tools & Chemicals › Chemicals & Water Testing Products. These are inspected returns and open-box items that Amazon sells and ships itself. WarehouseHunter puts each one next to its current new price, so you can see what you save at a glance.

Brands with the most offers here: Pool Mate, Clorox, Robelle, FROG, HTH, BioGuard, Poolmaster, ProTeam. Every item is a one-off, so the stock moves all day and new deals keep arriving.