Please choose the correct ending to complete the given sentence: Education and Communications: [header] How to add hot tub chemicals [title] Test your water's total alkalinity. [step] When you fill up your hot tub you need to check the alkalinity of the water. You may even want to repeat this twice per week.

Ending1: To do this you first need to read your personal user manual. [substeps] Some hot tubs have an alkalinity assist meter located close to the water's pitcher. Ending2: To test your water's alkalinity a bit, submerge your measuring cup in the water and let it cool. If your water is considered too hot, it could burn your fingers. Ending3: The goal is to establish how alkaline your water is. This needs to stay between 80 and 120ppm. Ending4: This test checks the ph of the water, which can help determine if your water is too hot to add any chemicals. [substeps] Turn on the faucet or shut off your water.

Answer format: ending1/ending2/ending3/ending4