Please choose the correct ending to complete the given sentence: Home and Garden: [header] How to acid wash a swimming pool [title] Drain your pool completely. [step] As you drain, make sure to clean up any debris as you go. If your pool has an autofill, you should make sure that you turn it off during the drain.

Ending1: This will help clear up the acid from your pool, and help ensure that your water maintains its ph level. [title] Remove the pumps, hoses, and filters. Ending2: Then, deactivate the auto fill or another hose after the deactivation, and flush it down the drain. [substeps] Depending on the size of your pool, you may also need to activate another hose to cycle to clean the pool. Ending3: [substeps] If your pool has a autofill, make sure that you turn it off immediately. [title] Fill a large colander with some water. Ending4: Once your pool is completely empty, start the acid-wash process. [title] Change into protective gear that includes clothing, goggles, mask, gloves and boots.

Answer format: ending1/ending2/ending3/ending4