Short Answer: Although one may not add anything to a mikvah that changes the color of the water, it is permitted to add clear chlorine to a mikvah, especially if it absolutely does not change the appearance of the water.
Question: What is the required depth of mikvah waters?
Short Answer: Water in a mikvah must be a certain height above the middle of the immerser’s body. Accordingly, many mikvaos are approximately four feet deep.
Question: Should observant Jews strive to build mikvaos in non-observant communities? Should a mikvah (run by observant Jews) allow non-observant Jews to use the mikvah for conversions?