Conclusion:
After hours and hours of running a pump from the bowl to the inner ring using bleach then vinegar and after using lysol black and sitting there with a pumice stone grinding away I'm done!! Results: All the mold is killed and gone except for possibly the front of the inner bowl ring. The pump was not strong enough to shoot the bleach water that far (I was using an 80 gph pump...shoulda got a 400 gph pump). Don't laugh, but I'm going to use a pipette and shoot straight bleach into those front jet holes. I'll let it sit in there all day. That ought to kill any mold that remains in that inner ring.
With all the pumping, all the chemicals, all the pumice, all the elbow grease I got off maybe 20% of the limescale. I did the back of the toilet because that's really all you can see. I gave cursory attention to the sides and front and improved it a little. But with the mold gone it is better than what it was. It simply is not worth any more effort for a $150 toilet. Two more to go but the learning curve has been surmounted.
Preventative Maintenance
Limescale:
Going forward I will use that lysol black perhaps once every 3 - 6 months to delime any new scale. That should keep it from getting worse. I am also looking into getting a whole house water filter. I know those filters are good for sediment but not sure how good they do for limescale. More research needed.
Mold:
Because mold takes a long time to establish itself in the inner ring I can probably do a bleach purge every five years or so. Truthfully, it's beyond my time horizon and will probably do nothing unless I begin to see it appear again.
Tip for those interested: If you don't want to monkey with a pump (it's no big deal really) you can probably do near as good a job simply using a pipette and shooting straight bleach in every jet hole. Let it sit overnight. It will rinse out with the next flush. That should keep the mold in check and requires very little effort.
Here, I found a video of the pump method. I had the exact same issue but the limescale left behind was way worse than what this dude had.
After hours and hours of running a pump from the bowl to the inner ring using bleach then vinegar and after using lysol black and sitting there with a pumice stone grinding away I'm done!! Results: All the mold is killed and gone except for possibly the front of the inner bowl ring. The pump was not strong enough to shoot the bleach water that far (I was using an 80 gph pump...shoulda got a 400 gph pump). Don't laugh, but I'm going to use a pipette and shoot straight bleach into those front jet holes. I'll let it sit in there all day. That ought to kill any mold that remains in that inner ring.
With all the pumping, all the chemicals, all the pumice, all the elbow grease I got off maybe 20% of the limescale. I did the back of the toilet because that's really all you can see. I gave cursory attention to the sides and front and improved it a little. But with the mold gone it is better than what it was. It simply is not worth any more effort for a $150 toilet. Two more to go but the learning curve has been surmounted.
Preventative Maintenance
Limescale:
Going forward I will use that lysol black perhaps once every 3 - 6 months to delime any new scale. That should keep it from getting worse. I am also looking into getting a whole house water filter. I know those filters are good for sediment but not sure how good they do for limescale. More research needed.
Mold:
Because mold takes a long time to establish itself in the inner ring I can probably do a bleach purge every five years or so. Truthfully, it's beyond my time horizon and will probably do nothing unless I begin to see it appear again.
Tip for those interested: If you don't want to monkey with a pump (it's no big deal really) you can probably do near as good a job simply using a pipette and shooting straight bleach in every jet hole. Let it sit overnight. It will rinse out with the next flush. That should keep the mold in check and requires very little effort.
Here, I found a video of the pump method. I had the exact same issue but the limescale left behind was way worse than what this dude had.
Last edited: