[Topspinmo]

IMO added chemicals in tanks which breaking down the black rubber polluting the tank. Cleaning IMO won’t do no good, replace all seals, flappers, ect… recommend don’t put any chemicals in to tank only the bowl if you have to?

You see black washers that hold tank on, mostly they are problem, see date on fill valve, see how clean tank is, cause I put no chemicals in top tank. Those minor stains you see are old from lessons learned.