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Brown stains in your toilet bowl are most likely limescale. Limescale happens from lime being left behind from hard water evaporating. Once dried out, the minerals also catch dirt and bacteria which eventually accumulate into the brown or blackish stain you see in your toilet. To remove thick and hard limescale from your toilet, use a mixture of vinegar, lemon juice, and baking soda, and scrub with a metal scrubbing brush.

Most toilets have a 12-inch rough-in or hole, but some have 10- or 14-inch holes, which means that not all toilets fit all setups. Knowing how to measure the rough-in is essential, so you purchase a toilet that fits the existing drain hole. It can be costly to have the rough-in moved, and most stores don’t accept toilet returns.

The first step to clearing the air in a line is to locate the cause. This is usually a blockage in either the drain or the venting system. Once you clear the issue, flush the system by actually flushing the toilets repeatedly. This should allow the trapped air to escape, thus clearing the lines. Don’t be surprised if there is increased bubbling as the air makes its way through the system. 

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.