Randy Holmes-Farley
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I wash my filter socks in bleach, rinse and let air dry before putting them in my sump so I suppose I am inadvertently dosing bleach with no adverse affects. I always wondered about this so I'm glad to see this post. BTW; what does ORP stand for?
ORP is the oxidation/reduction potential. It is a measure of the relative oxidizing and reducing power of the water. I know that doesn't say much to many folks, but it is a very complicated measurement that its its ultimate root in seawater, may primarily reflect the relative amounts of trace metals in more oxidizing states (e,g., ferric iron, Fe+++) and more reducing states (e.g., ferrous iron, Fe++).
Don't believe some old time reefers who claimed that higher ORP was necessarily better.