L
Lee
Peggie, The regular clorax bleach used to say on the bottle that it can be used to purify water in an emergency so I had no problem using it in my tanks. Lately the clorax and other bleaches are called ULTRA which contains something else(?) in it which eliminated the statement that can be used to purify ..... In fact it contains a warning that it should not be used for that purpose. Do you know what the ULTRA thing is? (it's probably on the bottle but I wouldn't know what it meant anyway since I'm not a chemist). Nobody seems to carry regular pure bleach anymore. Even the store brands add the ultra to match Clorax. Thanks.