Can I fill it with sand to prevent pool pop then remove the sand when I want to use it? I understand the drain may get sand in it. I was hoping to water jet it out when I reopen the pool.
the problem is, without water in the pool, the surface will begin to deteriorate quite rapidly, leaving you with thousands of dollars in damage. Also, when water pressure begins to rise under the pool, it will start pushing that ground water through your hydrostatic relief valve. With sand in the pool (main drain too), sand will then get lodged in the valve keeping it slightly open. When you go to "use" your pool years down the road, even though you may think you have all the sand out, it only takes one tiny particle to keep that hydrostatic valve from shutting all the way causing a "leak" in your pool water that you may never even realize this issue that caused it. Honestly, the best option would be to just keep water in the pool, install a salt system which will maintain the chemistry for the most part for you, then leave it at that.