We have a little 650g above ground pool for the kids. The pleated paper filter that comes with it is basically useless.
I'm trying to build my own sand filter using a 5g bucket. Please take a look at this drawing and let me know if this will get the job done.
During normal operation, water would drain from the pool outlet and into the sealed lid on the 5g bucket. There's sand in the bucket and a strainer at the bottom to keep the sand from leaving the bucket. Water flows through the bucket and into the pump. Water is returned to the pool.
Green lines are ball valves. During normal operation, the valve on the top purple line would be open to allow water to drain out of the pool and into the 5g bucket.
Also on top of the bucket, there's a Tee line and a ball valve that would remain closed during normal operation. This is my waste line and would only be opened during back flush.
There's a couple ball valves to isolate the pump during back flush. I plan to back flush with water pressure from the pool. During back flush, I'd close the ball valves on either side of the pump to take it out of the loop. Open the valve on the cross line above the pump. Open the valve on top of the bucket so water can flow out the Tee line. That will essentially allow the sand filter to back flush using head pressure from the water in the pool.
Open to suggestions and criticisms. Thank you.