I have filled a few in also... the largest took 28 laods to fill it... It was at an apartment complex. Looks good to this day. Cut large holes in the bottom of the deep end, cut the sides down 2' and pulled them in as we filled it. The deck we hauled away as the concrete dump was not that far away. Took about 4 days to complete as I couldnt get the truck to the pool and had to use a T300 bobcat to move ALL the dirt to the pool. After we filled it in, threw some sod on it and called it good.. never settled in we filled it in little by little and tracked it in the whole way..