1 lb. Toilet Tank Cleaner

Yes, Instant Power Toilet Tank Cleaner is safe for use with septic systems.

Hi! It borders between fresh scent and no scent. Hope that helps! Thank you for using Instant Power!

Thanks for contacting Instant Power! Toilet Tank Cleaner is a mild acid that will go after rust, lime and calcium. if any of these are on the brass bolts it will try to remove it. It will not harm the brass, but again will go after the rust, lime and calcium. you can use half the bottle or a quarter of the bottle for test purposes. I have used this with great success in all of my toilets, just don't overuse, more is not better in this case. if you have further questions, you can call our help line 800-613-4242. thanks again for contacting Instant Power!

Thanks for contacting Instant Power! Toilet tank cleaner is septic safe. So no worries. Thanks again!!

No idea, check consumer report, The idiots working there spend more time hiding from shoppers, go to your local hardware store if you want an answer ...

Yes I believe I read that it was....i used it on our septic system to clean out all of our toilet bowls. Worked really well. Better than I expected.

Absolutely. I live in the country so lots of hard water. Couldn't believe what a great job it did.. I keep reordering

It worked best for me (three tanks) when I poured half the bottle in the tank and then used a brush on the sides and bottom of the tank. After light brushing, the tank came much cleaner than when I just poured it in and waited the designated time. Great results!

For that big of a buildup I don't know how well this would work. I would scrub as good as I can and then mix a strong concentration of the TOILET TANK CLEANER and put it into the tank and bowel and let it sit for at least twelve hours. It will take more than one treatment for something that big.