S WELL. 13800-H20-64700. EFFERVESCENT WATER BOTTLE CLEANING TABLETS. A fresh S well has never been easier thanks to our new S well Cleaning Tablets. They clean tough stains and odors in less than 30 minutes with powerful effervescent bubbles. It s safe and easy to use with our natural biodegradable formula. No scrubbing needed. Chlorine and Phosphate-free.