[getter done]

What is the best way to prep a concrete floor that had ceramic tile before, I removed it with a chipping gun and tried to skim all the high spots, but after the dust settled I notice that there are still high spots and low spots. Not to concerned about low spots because they can be filled in with thin set.

[ballengerb1]

Your low spots must all be brought up to the level of your high spots. Unless you have a small isolated spot that is high you need to forget chipping and go with a self leveling cement. I would also recommend that you not tile directly on the cement floor, cracking will likely happen. Do some research on Ditra Schluter-DITRA - Schluter-Systems so you can eliminate this problem.

[getter done]

1 wanted to say thank you for your help. Sorry I didn't get to you before now but as you are probably aware of a bathroom remodel is a lot of work and one thing after another. All is going well. Do you know of any helpful tips for grouting, especially the final clean up. I know about using plenty of clean water, 3 bozo buckets works fairly well.
Hope this is the right way to thank you.