Review on 🚰 J.C. Whitlam FLOW32 Flow-Aide System Descaler - 32oz (1qt), White by Diana Johnson

I have used it to flush a Noritz water heater and also with a Superior Pump submersible pump which Amazon buyers use frequently. 40 minutes - a lot of black stuff in a bucket. This is not to be expected when removing limescale and I suspect this is due to corrosion in the pump. At least I really hope it doesn't corrode anything in a tankless water heater! I couldn't find a specific ingredient list, but the MSDS says <10% hydrochloric acid. This is some really powerful stuff and if the concentration is 9% it will be much higher than the 5ppm mentioned in another review. Attention! I wish I had read the other reviews more carefully. Also, it cost me about $20 a liter. Three gallons of vinegar, as Noriz actually recommended, would cost about $15.