one of 3 things......worn laterals in the bottom of the sand filter, the sand might need changing which should be changed every 5 yrs ish or are you doing regular back washes..at least once a week.
I had an inground pool installed. We just turned on the lights at night and noticed footprints on the bottom. Can this be fixed? Call the pool company back. The bottom is normally sand mixed with cement. The liner will probably have to be removed and bottom smoothed. They should have checked that before installing the liner. Those printswi catch sediment and debris for the life of the liner.
Vermiculite is not a suitable substrate.
Theoreticaly Yes
they have cancer
Yes it can be done
Rockslides
the concrete should be 6" according to this site http://www.de-fontenay.com/poolcon4.htm
It is the dream where you are falling but never seem to hit the bottom.
YES.
Bedrock should be about 64 blocks down from sea level. Bedrock is indestructable and there are no real benefits in finding it, it is simply the bottom of the map. Digging straight down is dangerous because there is a risk of falling in underground lava pits.
You need a pool tele pole that is 8' and extends to 15' k
If they feel main drains are not required that brings their marketing/ sales practices into question.