Cleaning paint tools bad for drains?
If you are using a drain that gets frequent use it will self flush. I have been cleaning my paint tools ( i am a pro- so this is almost daily) in my slop sink for many years. I live in a very old house where plumbing probs happen anyway- and have not found that the paint make it any worse.
If you are cleaning setting muds- it is always best to scrape out and toss as much as you can before washing- that is heavier.
Another thing you can do is first clean most of the paint out of brushes and rollers into a 5'er half filled with water. Then finish in sink. The solids will drop to the bottom of the 5 in a couple of days and most the water can be poured off- and the rest dried out and tossed-
Just some ideas.
"It's better to come here with questions before you screw up than to come here after and ask how to fix them."- JS