Many thanks to Eddie for his Whink recommendation! I'm a fan! I just got a bottle of it today at OSH and was amazed at how little effort with the bowl brush was required to remove the stubborn mineral ring (see picture -- the worst area was toward the front of the bowl). Instructions said to apply and flush, but I hit it with the brush for good measure before flushing. That ring had been there a while.
OSH also had Whink rust and mineral inhibitor tablets, so I got a 2-pack of those and dropped one in the tank. If the ring doesn't form again, I'll be buying the tablets regularly. From what I read on the package, they won't harm my new Korky flapper.
On the Whink bottle was a form for a $2 rebate with purchase of two Whink products. Woo hoo!

OSH also had Whink rust and mineral inhibitor tablets, so I got a 2-pack of those and dropped one in the tank. If the ring doesn't form again, I'll be buying the tablets regularly. From what I read on the package, they won't harm my new Korky flapper.
On the Whink bottle was a form for a $2 rebate with purchase of two Whink products. Woo hoo!
