How can I lower the water level in the bowl of a comfort height Kohler 1.6l flush with canister valve?
High water level in toilet bowl after flushing
toilet
Related Solutions
It looks like you are missing your fill hose. There should be a hose connecting the outlet at the top of your fill valve assembly running into your overflow tube:
Even though you snaked the line near the toilet, it sounds like the line is still blocked or slow draining such that standing water sits in the line above the point of connection to the vent. Vent lines for toilets are often connected as shown:
Standing water above the reducing wye where the vent connects will cause water to be pulled from the toilet bowl as water flows down the line (such as when the other connected toilet is flushed). A flood when you flush both toilets indicates the sewer line is slow draining and cannot handle that much flow. Possibly the vent is plugged. More likely there is an obstruction such as tree roots infiltrating the line. If you have a septic system then it is time to pull the inspection lids, especially the one at the inlet. Check for obstructions such soap caked near the intake baffle.
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Best Answer
You can't adjust the bowl water depth - it's set by the height of the trap that's cast into the bowl. However, you can adjust the water depth in the tank as suggested by @Daniel Griscom.
There also might be an obstruction in the trap that's artificially raising the height. Plunge and/or snake should take care of that.