Fluidmaster Flush N' Sparkle No Scent Continuous Toilet Cleaning System Refill 2 Liquid

Flush N’ Sparkle puts a cleaning solution directly into the overflow tube of the flush valve, so no chemicals ever touch the flapper or fill valve. This prevents the damage that a drop-in tablet normally inflicts while keeping the bowl clean and sparkling. The 8100 kit contains a blue cleaning solution that lasts up to three months. Replacing the cleaning solution cartridge takes less than a minute. Relax and let the toilet clean itself with Fluidmasters Flush 'n Sparkle Cleaning System.