I am seriously impressed with this excellent product! The motor failed on our bio-disc septic tank a few months ago and it smelled vile, but within a week of adding Muck Munchers there was no smell at all. It is now 12 months after our last pump-out and I expected that the tank would be brimming with solids as usual, but there just aren’t any. All I can see is fairly clean-looking water and a little bit of scum on the surface. This has saved us about £100 in the first year which is a cracking result all round. All my neighbours have septic tanks, so I am spreading the word!