Probably why it's being discounted? Your comment was the first though that came to mind. (angel)
Looks fancy I've never heard or seen this, it's probably something they keep before a plastic lockbox thingy in my local
Wet Cement ;)
Have used this for about 20 years plus. Have never had any problem with stubborn grime. Brilliant stuff, in my view.
The point of a septic tank is that bacteria breaks down the solids, if you start adding bleach or most cleaning products then it kills them (and I think the pumping company gets a bit annoyed). Every house I've been to with a septic tank uses these Ecover products for everything. It's not the best product in the world, but if you want to escape inner city acid attacks and commuter armpits, then living way out in the sticks is one solution.