Please choose the correct ending to complete the given sentence: Home and Garden: [header] How to maintain well water [title] Check your well cover and well cap every 1-2 weeks to ensure it is intact. [step] A broken or missing cap can lead to well pollution, so take a peek at your well cover and cap periodically. If your cap is removed or broken, hire a professional to test your water and replace the cap.

Ending1: [substeps] Look for any broken pieces, and ensure your cap is still attached to your well. [title] Examine your well pump for leaks every 1-3 months. Ending2: [title] Avoid using distilled or carbonated water. [step] Carbonated water can become brackish, which can cause problems around your well. Ending3: Your approval of drilling is one of the most important elements in any rebuilding of your well. [substeps] Don't drill holes that are larger than 3/4 of a full meter's thickness. Ending4: [title] Use a working group to test your water for nitrates. [step] It is an important first step to maintaining well water by testing water for nitrates.

Answer format: ending1/ending2/ending3/ending4