Q. I travel a lot for my job, so I have automatic feeders for my cats, along with an automatic water dispenser that I keep filled for them outside. The problem is that by the time I get back home, the inside of their water jug and bowl that it drips into has turned green. Is there any small amount of Clorox that I could safely put in their container to keep it from "going green"? I clean it out with a water and Clorox mix, rinse it well, refill and hope the "green slime" will not return, but it always does. What do you recommend?

A. The water container should be thoroughly cleaned and sanitized before use. If possible, I would do this in an automatic dishwasher and then follow the directions below.

The following are directions from our EPA Master Label for Clorox® Regular-Bleach:

When you leave, you can add a couple of drops/quart to the water to produce the 5ppm: