zeolite is not sand, it is another media all together as wizzard pointed out above. It is used in pool filters instead of sand because of its physical properties. It is shaped more like a crystal or snowflake instead of a cubical grain. This irregular crystal shape allows it to catch more debris in the pool water than the cubed sand. I don't know how it would affect the ph of your water. I do not know of any special procedures to follow to keep the ph in your pool to stay at 7.2 . If it would affect the ph drastically then you would need to keep messing with the ph in the pool and that is not needed so I guess the ph would be okay. I personally would not use it, it is an unknown in aquaria and is more expensive than sand.
Brian