Quote Originally Posted by Watermom

10% sodium hypochlorite is just strong bleach. Household bleach is 6%. However, if it has been sitting for awhile, it isn't going to be full strength. You can go ahead and use it however. Just make sure it doesn't list any other stuff besides sodium hypo. It may not raise your chlorine level significantly if it is really old and weak, but it won't hurt to use it up.
Watermom - All it says on the "strong bleach" bottle besides the 10% sodium hypo is "other ingredients - 90%" so I guess I don't know if it contains anything else???