Use with pool water testing kit to determine calcium hardness | Lets you know when calcium level is too high, so you avoid scaling | Lets you know when calcium level too low, so you avoid corrosion | New Taylor R 0011L A DPD Reagent #11 0.75 oz Dropper Bottle | Testing lets you adjust levels to prolong life of pool
New Taylor R 0009 A DPD Reagent #9 .75 oz Dropper Bottle | Replacement bottle for Taylor Swimming Pool Test Kits | Tests for Sulfuric Acid | 3/4 ounce bottle | Part Number: R 0009 A