Using an above ground pools sand filter on a pond?

[gourami guru]

So I have a 650 gallon above ground pond. At the moment its under filtered. Ive been working on a diy filter for a while now with no luck. I was wondering for a few hundred dollars if I could just use a 1/4 horse power sand filter. Ive done a little research and heard they filter so well that they need to be back washed all the time. I also heard you could use a mixture of gravel and sand to help with that. Just wondering if anyone here has done this or has any impute, thanks!

 

[kendragon]

I have done this. Is it indoor or out? They tend to compact with algae if outdoor and media is sand only. So gravel or plastic media would be a good choice for outdoors.
I currently have a pool sand filter with plastic bead media for my indoor tank. Works great.
Just be cautious of the amount of water required for a complete backwash. It may drain the pond too much.

 

[gourami guru]

Sweet I think Im going to get one. Its indoors so no algae. Any recommendation on size? The pond is as stated 650 gallons. Im looking at one thats 19 inches diameter and 2900 GPH