I tried the new shower pan floor today and discovered what I had suspected, that the drain is higher than some of the surrounding floor. The floor is made of mortar and is now covered with ceramic tiles. When I installed the mortar bed I found it difficult to ascertain the grade of the concrete and I have indeed messed it up. The water is sitting about a quarter of an inch deep in its worst puddle. Could I find some kind of leveling product and cover the existing tiles with another layer of tiles or am I faced with the pleasure of chipping out the tile floor completely. It is not all that large but it would not be a fun job.