DIY Plywood tank, with INLINE filtration?

[LoogieLV]

To ensure better filtering of the tank, couldn't you have the return line pour into a painted/hidden vertical pipe or compartment so that the return water actually enters the tank near the bottom. Just have the return line pour into the standing pipe, etc. to preven the dreaded siphon.

I put a pipe with a tee at the bottom in a DIY pond filter. The top of the pipe extends above the water level in the tank so that water filling the filter enters the bottom and flows upward (through 25 lbs of large river gravel, layers of floss and sand) to the outlet (DIY bulkhead draining back to the pool) at the top. (the filter is upstream of the pond).

really not a bad idea at all. I'd rather use the return line to offer more circulation though...