Multi-choice problem: Continue writing the next sentence in this paragraph:

How to dechlorinate pool water
Stop adding chlorine to your pool.
Simply stop adding the chlorine tablets that you regularly put in your outdoor swimming pool. Exposure to sunlight will gradually dechlorinate the water.

OPT: 1. You'll need to leave the pool uncovered for two weeks. Use a bucket to dechlorinate a small amount of water.. 2. This is because chlorine acts by converting water into ammonia. However, ammonia can do damage to the biological processes that preserve the ammonia molecules, which will affect evaporation rates and/or cause pool water to stink up.. 3. Fill a large bucket with the water. Fill a large bucket with 1/2 a liter (0.8 us gal) of chlorinated water.. 4. Move a 5-gallon bucket around the area. Easily scrub away any algae that is dry around the edges of the bucket..
1.