[MollyJo]

I would not leave bleach in the toilet bowl, it could erode the surface permanently.

[rrman77]

You are right!!!

[rrman77]

No chlorine left in water, so long standing water can allow mold to grow. Drop in a capful of bleach before you leave.

[Jhind]

The Palmerstone will scratch the porcelain surface, allowing more mineral buildup in the near future. You are opening up the porosity of that surface to more issues.

Toilets are made, and finished with a smooth porcelain finish for a reason, to move the waste materials with very little friction

[Boiler]

We were told by Nova installer that system takes chlorine out of water. To replace the chlorine to continue sanitation, we bought chlorine discs from Lowe’s and put in the toilet tanks. It works like a charm.

[Skip]

Originally Posted by Jhind

The Palmerstone will scratch the porcelain surface, allowing more mineral buildup in the near future. You are opening up the porosity of that surface to more issues.

Toilets are made, and finished with a smooth porcelain finish for a reason, to move the waste materials with very little friction

I agree. Don't scour porcelain.

Skip

[retiredguy123]

Originally Posted by Skip

I agree. Don't scour porcelain.

Skip

I have used a pumice stone to remove calcium/lime deposits from toilet bowls for many years. That is what it is recommended to do. You need to keep the stone wet while using it. I have not found any cleaning chemical that will remove the calcium build up. Bleach and vinegar definitely do not work.

Can you scratch a porcelain toilet bowl with a pumice stone? Yes, if you use it incorrectly.

[GladysM2024]

It is a bacteria and you need to chlorinate the entire toilet.
If you are not regularly flushing, bacteria grows even with a filter.
Flush your hot water heater of sediment and it will be ok to use the water.

[GladysM2024]

If that were the case it would be in all toilets, bowls, faucets.

[Nova Filtration]

Originally Posted by gorillarick

I know nothing about Nova.

Black ring sounds like a carbon (charcoal) filter collapsed/leaked into the water.
Should look like very fine black particles.

Our filters are made solid, they can't collapse, the ones that collapse are call pleated filters

Originally Posted by retiredguy123

The ring at the water level is an accumulation of calcium deposits that is formed when the water in the bowl evaporates. The mold grows on the calcium ring. Use a pumice stone to remove the calcium from the toilet bowl and you will stop the mold from growing.

We don't recommend use a stone it can scrach the surface making the issue worse

Originally Posted by loufromnewjersey

Nothing to do with the filters. This is mold from standing water. Clean bowl before you go and/or put some bleach in.

Worth a try

Originally Posted by jimkerr

This is the correct answer! I’ve done this on one toilet of ours that doesn’t get used a lot and gets a black ring. The pumice stone takes care of that ring and it stops it from coming back for quite a while.

Not recommended

Originally Posted by MollyJo

I would not leave bleach in the toilet bowl, it could erode the surface permanently.

Not true, if you think about all the homes in the USA that don't have filters the chlorine is there all the time.

Originally Posted by Jhind

The Palmerstone will scratch the porcelain surface, allowing more mineral buildup in the near future. You are opening up the porosity of that surface to more issues.

I agree don't use it

Toilets are made, and finished with a smooth porcelain finish for a reason, to move the waste materials with very little friction

Originally Posted by Skip

I agree. Don't scour porcelain.

Skip

Correct

Nova carbon does a great job removing Chlorine and chemicals.
The lack of it in toilets causes this.

We recommend a good scrubbing with CLR in case there is a calcium deposit since the home does have a softener.
or
For hard water stains or particularly stubborn marks, sprinkle baking soda onto the affected area, then pour vinegar on top to create a fizzing reaction.

Then a chlorine tablet to the tank, (no it will not harm anything)

Then about 2X a year use Clorox Clinging Bleach Gel under the rim, it has a angled tip to get under the rim.

[retiredguy123]

If you go to Amazon.com and type in pumice stone, you will get 2000 responses, most of which are sold to clean toilet bowls. None of the chemicals suggested on this thread will remove a calcium ring around the toilet bowl water line. I have tried them all.

[CybrSage]

Originally Posted by retiredguy123

I have used a pumice stone to remove calcium/lime deposits from toilet bowls for many years. That is what it is recommended to do. You need to keep the stone wet while using it. I have not found any cleaning chemical that will remove the calcium build up. Bleach and vinegar definitely do not work.

Ever try CLR? It is designed to remove Calcium, Lime, and Rust deposits.

I do not get black ring issues so I have not tried it. Heard good things about CLR though.

[Risuli]

Be careful about the chlorine disks that drop in the tank. Yes, they will keep mold from forming, but depending on the type of toilet they can cause issues. We have Champion 4 toilets and the "drop in" chlorine tablets erode the seals on the flush valve which will cause a continual slow leak.

[CybrSage]

Originally Posted by Nova Filtration

Then a chlorine tablet to the tank, (no it will not harm anything)

I looked at over 10 different plumbing company websites about chlorine tablets in the toilet tank and they all agreed it is bad to do. The chlorine destroys the rubber gaskets and plastic parts. Some said it also causes metals to rust faster.

This is because the tablets greatly increased the amount of chlorine in the tank from 5mg/L to 1000mg/L.

"Chlorine tablets can damage toilets by corroding and breaking down plastic and rubber parts. This can lead to leaks, clogs, and other issues. "

[retiredguy123]

Originally Posted by CybrSage

Ever try CLR? It is designed to remove Calcium, Lime, and Rust deposits.

I do not get black ring issues so I have not tried it. Heard good things about CLR though.

Yes, I currently have two bottles of it and also Lime Away. These products are good for cleaning chrome drain popups and fixtures, but they cannot remove a calcium ring from a toilet bowl. I guess, if you want to clean your toilet bowl every day, you can avoid calcium build up, but most people don't want to do that.