With the bottom of the swimming pool raised, you can now build the secondary wall to retain the sand. David uses 50-lb sandbags; typically you would fill these bags about 2/3rds so they stack properly. First, he puts down some geotextile (heavy-duty landscape fabric) to prevent the gravel from puncturing them. The polypropylene bags have limited strength, so to protect them, David also traps a spare piece of pool liner underneath and wraps it around the back of the wall and over the top.
Finally, he adds a layer of geotextile running from outside the pool area, across the gravel bottom, and up and over the front of the secondary wall. David suggests weighing the geotextile down with more gravel, but you could perhaps use something like paving slabs to make it more stable and secure. Then it’s just a question of covering the area with sand to finish the beach.
You may find that with regular use, the sand will tend to migrate into the pool, but it shouldn’t take a lot of work to rake it back periodically. You might also want to to give it a natural oasis vibe.
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