So here are some interesting chemicals for this issue other than the typical acetic and citric acid flushes.

diammonium citrate

phosphoric acid



Industrial Water Scale Remover For Aluminum - Descale 518

Heavy Duty Cooling System Cleaner


Dynamic will not sell to you as an individual - only to a company. However, their MSDS is very useful and can help you make your own.

The other chemicals mentioned in this thread will take longer, I think but they may be worth a shot if your system is still working 'well enough' and you just want to set it and forget it.

I want something aggressive that wont murder a bunch of small children and the entire coral reef.

Likely, I will try to source the main ingredient in 'Descale-518' after I try one flush with CLR.

__________________