It works, but be very careful. Too much acid will lower your PH, also lemon juice is just more bio-material in your system. Frankly, while it does work, it's not the most efficient way of doing it. If it's just a couple try injecting it with kalkwasser, or even extremely hot water. It's a lot safer. If it's more than a few, I would try more natural measures. i.e. butterfly, peppermint shrimp, etc.