My original plan was to use the 5' diameter pool covered by a tarp secured with tent stakes and ball stretch cord purchased during an impulse trip to Harbor Freight (hypocritically ignored the rules I laid out here) but I quickly realized it required too much sand (even after correcting math using diameter instead of radius to calculate volume of sand needed, doh!) so we procured a 3.5' diameter pool that was sufficiently filled with 4 bags of sand ($10).
A little dressing up with some leftover limestone and the project was complete!
I
can anticipate the next question--What about that old pool that spawned
the idea in the first place??? Fear not, it now serves as a cheap and
easy to use cover!
Total
cost $21 (would be about $30 if had to buy 2 pools, not including
limestone cost since it's not a functional part of the sandbox system),
total time to "build" about 10mins, including time spent drinking a beer
watching our 13yr old carry the sand to the back yard. Success!
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