I'm looking for a safe-for-septic-tanks drain cleaner. I have a slow drain in the bathroom basin that will not stay clear. I use a plunger and it clears for a few uses, than slows up again.
Suggestions? Preferably something you tried and which cleaned drain and didn't harm septic tank. I'd prefer this over package assurances of safety; ink is cheap, pumping septic tanks is expensive.
Too old to tear drain trap apart.
TIA