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

You are right!!!

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

No pumice Stone
 

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

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.

I agree. Don't scour porcelain.

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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.

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.

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

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

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

Worth a try

Not recommended

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

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.

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.

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.

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.

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. "

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.