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Title: Not Much of a Product
Review: UPDATE: Utterly useless. Still inconsistent in several tanks; deep blue, no blue pale blue. Look in the tank and it's a blue ooze. Do not waste your money as I did.Original: I bought the multi-pack and dropped them into my office and home toilet tanks - a total of 4. None works consistently. Sometimes it's a deep blue color, other times pale blue or in-between. Critically, after a couple of weeks use, the rings I scrubbed off prior to putting these in the tanks have returned as have the flush marks. I will not buy again and do not recommend at all.
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