It鈥檚 not that great. My tanks still read full, I鈥檝e used every single bit on on my grey tank, just as the instructions say, and still nothing. I wouldn鈥檛 recommend this. If your a full timer like myself, and you鈥檝e been having this issue for a while, I鈥檝e tried this and it didn鈥檛 BLAST a thing. Not a single thing. A little bit came out and it was terrible, but not even to make any kind of a change. The sensor still reads full, alas I鈥檒l keep trying and see if there is anything that does blast it.