bleach as a disinfectant
bleach makes a great surface disinfectant when used full strength, the problem with using bleach as a dilute disinfectant to drain water is this ; bleach is made from salt water and reverts back to salt water shortly after being oxidized (used), so its great for wiping things down, but in a situation such as adding it to drain water, even if it does a good job initially (and it will at high enough concetration) it is diluted easily and in doing so it is oxidized to the point where it reverts back to salt water and is no longer effective , in order for bleach to have any chance of working in a drain water situation(where new waste water is constantly being added, you would need a drip system that constantly adds new bleach). the problem with that is , the more polluted the waste water, the more rapidly the bleach oxidizes and reverts back to salt water, and is no longer effective, you can see the canundrum . bleach being made from salt water, and its ability to revert back to salt water, is why it is one of the few effective disinfectants approved for use on food contact surfaces. it is also why it makes a better wiping disinfectant than long term dilute disinfectant. in situations like waste water or swimming pools where new pollutants are constantly added, bleach would need to be constantly added to remain effective , otherwise you are just disinfecting with saltwater , not very effective jmo