I had a lazy, slow flush in my rental house. I had never had a problem in 9 years of living there. I paid R***Rooter $435 to fix it which they did not. I created such a stink that they sent the regional manager out and put a camera down the pipe. Of course the problem was the plumbing they said. It would need a new sewer pipe installed. Not a trivial task with the house sitting on a slab. Wait a minute I said. You are full of the same stuff clogging my pipes. So I looked elsewhere. I found the notorious green goo. The cleaning company that cleaned the house prior to the last tenant moving out put those green tidy bowl tablets in the toilet tanks. One look in the bottom of the tank told me what I needed to know. Being a scientist by training I knew that for a toilet to flush properly, the water had to move fast enough to generate the siphon effect to pull the water and waste up over the trap to clear the bowl. The thick viscous goo was making the water too viscous to do that. A garden hose and about 5 flushes solved the problem. I first hosed out the tank then filled and flushed the bowl and the problem went down the drain.
I wrote to R***ter Rooter and told them they were a bunch of theives. They have to know from exprerience of this problem especially in old houses, and it has to be a bigger problem for low volume toilets. If my experience is any example they are making millions at the expense of consumers by omission. They know, they just don't tell. Instead, they charge $100s or even thousands for unnecessary repairs. Beware anything you do to upset older plumbing. As they say, if it ain't broke, don't fix it. As far as I know, appliances were designed to function with plain clear water, not with the additon of a thick green slimey goo.
Keith