Comments: After reading other people revews and watching a commercial on the website I expected Hydor to work well. To my gratst dissapointment, I could not get calcilum and coralline depost off my pumps after12, 24 and even 48 hours soaking. I added a second package to strengthen the solution, but very little effect. In desperation I tried vinegar and it worked so mch better! After overnigth soak all deposits softened up and I ws able to wash them off with a little bit of scrubbing. DO not waste your money on this product. Sorry, Hydor people, you need to do a better job. Try vinegar. Cheap and effective.

Comments: This product works great I use on power head, and heater. Only takes 30-40 mins.to clean. I use it once a month.

Comments: The hydor cleaning tablets work great my pumps had a ton of calcium deposits on them and in no time they were spotless. Great product highly recommend it to anyone who wants to clean there accessories.

Comments: This product really works great!!

Comments: Definitely works as advertized....

Comments: I compared this stuff to white vinegar that I purchased at the store. Both work, but this was a little better.
<br />It is easy to prepare and easy to use. I got a sample as RAP and tried it. I liked it so I purchased some.
<br />(Guess that sample idea is good marketing)