Please choose the correct ending to complete the given sentence: Home and Garden: [header] How to raise ph in pool [title] Test the pool water's ph level with test strips. [step] Get ph testing strips at your local pool store, big-box store, or order them online. Follow the product's instructions, which are typically dipping the strip into the water and checking its color against the range listed on the product.

Ending1: Dissolve or screw the strip into the pool water and use it to test the water for ph. [substeps] Consult your local professional pool store or search online to determine if the test strips will clearly show your ph. Ending2: [substeps] Test samples and readings on the test strips. Some tests touch on ph, but others don't. Ending3: [substeps] Consult your product's instructions for the ph level you should test. Phosphate-free, ph under 16 percent is the ph needed to raise ph at the pool, while ph below 19 percent is the ph required to go swimming. Ending4: [substeps] Some ph test kits require you to fill a small tube with pool water and add drops which change color based on the ph. [title] Check the chemical levels one to two times per week.

Answer format: ending1/ending2/ending3/ending4