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You generally cannot replace a 10-inch rough-in toilet with a 12-inch model without making significant plumbing updates. A 12-inch rough-in toilet will not fit a 10-inch rough-in space because the floor drain is in the wrong position. To accommodate the larger toilet, you would need to move the drainpipe, which could cost between $0.75 and $30 per linear foot, plus labor. In most cases, it is more cost-effective and simpler to purchase a new 10-inch rough-in toilet. However, it is possible to install a 10-inch rough-in toilet in a 12-inch space by using a longer connector.

While you shouldn’t increase the flow of your low-flow toilet by adjusting the water level in the toilet bowl set by the manufacturer, you can make the flow as efficient as possible by ensuring the rim jets under the rim are unobstructed. To do this, use a mirror to look under the rim and scrub them with a toothbrush or a small wire to clear any debris stuck in the holes. You can also watch for leaks, make sure the internal components are in good shape, and replace them if necessary.

The main cause of bathroom leaks is seals and connectors that loosen or deteriorate over time, causing leaks to develop. It's important to stay on top of your bathroom materials, as toilets, showers, and sinks all have different lifespans. Toilets and faucets last between 10 and 15 years on average with regular maintenance, but different parts may have shorter lifespans than others.

The normal water level in a toilet bowl is about halfway full. The water should sit above the P trap drain because this creates a seal and suction. When you flush the toilet, the suction keeps sewer gases from entering your house through your toilet. Anytime the water level is higher or lower than half full, you need to make adjustments or replace broken parts.