The problem with this is that the floor in our house is tinted concrete so we have very few options to remedy this.
How to level concrete floor for toilet.
Reconnect the water supply line and open the shut off valve again to turn it back on.
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Hammer a shim gently between the floor and the toilet base to bring a low side up.
If it is level enough to your liking the toilet is now fixed.
3 place a level on the back of the toilet.
Use tapcon anchors or a similar type of masonry concrete screws to fasten the toilet flange to the concrete slab.
There must be a 3 inch diameter drainage pipe rising up from the concrete as well as a water supply pipe coming from an adjacent wall.
If not you may need to make additional minor or major adjustments.
Screw the toilet flange onto the concrete.
With the toilet flange in place you are ready to install the toilet with a new wax ring.
Place the carpenters level across the toilet bowl side to side and note where the bubble level is.
Sit on the toilet again and rock back and forth or use a carpenter s level to precisely measure how even the floor is.
Set it back into position over the floor drain making sure the holes in the toilet base slide over the flange bolts.