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Amazon has the Fluidmaster Flush ‘n Sparkle toilet cleaning system on sale for $ 10. Free shipping with Prime or $ 35+ orders. These can easily be modified to use the 1" pool chlorine tablets instead of the more expensive OEM refills. Easy to install and keeps your toilet clean, stain-free, and sanitized with every flush. Unlike drop-in tablets, this system will not damage your toilet’s tank components as the chlorinated water is sent directly to the toilet bowl.