Have 2 Gerber 1.6 gal toilets that flush water thru holes in the underside of the elongated bowl edge. Find even with frequent cleaning ?mold? builds up and brushing causes black flakes to be loosened but openings never become completely clean.
Are there any suggestions for an additive to the tank water, or other approaches to keep the passages clean ?
Are there any suggestions for an additive to the tank water, or other approaches to keep the passages clean ?