Use a grid of CPVC from OSH etc, simply cut the pieces to length, add
Tees and elbows and drill small 1/16" holes in the bottom of the pipe.

CPVC is smaller than normal PVC and this type of UG does not entangle
roots.

Use it in reverse and you can use any sized grain, even the finest
sands.

Cost 10$ for any size and all you need is a drill/bit and saw/cutter to
cut the pipe.

Regards,
Tom Barr


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Regards,
Tom Barr