I have 3 different brands of ultrasonic humidifier that would accumulate pink slime at the base and exhaust, even I use filtered water. I try PureGuardian Aquastickif it works so I do no have to clean humidifier every few days. I clean the humidifier with vinegar and flush thoroughly before put in the PureGuardian Aquastick. Actually these PureGuardian Aquastick make it even worst and the pink slime accumulate much faster such that I have to clean the humidifier every day.
I took out these Aquastick and try the Protec PC-1C-BX Cleaning Cartridge. I have been using Protec PC-1C-BX for 2 humidifier for 4 days and so far pink slime have not accumulate yet. Even though the Protec PC-1C-BX Cleaning Cartridge is smaller in size but it works better than Aquastick.
Hope Protec PC-1C-BX will works for a months as it claim.