[schildkoi]

Quote: Originally Posted by garywalker I live on a ridge and my pond site is underlain by solid rock. Digging the pond hole required a lot of work and I am not willing or able to dig a hole for the filtration system that is even deeper. Therefore I cannot use a gravity-fed filtration system. In this circumstance what is the best layout for the pump and filter system? Gary

Gary,
You are making a decision that although is your's to make, may vary well be one that you will regret later and for many years to come. But, like I acknowledged, its your decision to make. I would however suggest that you still do a 4" bottom drain with diffuser and run the 4" line underneath and up the outside of the pond. At least in this manner, should you ever change your mind, the drain and lines will be in place for a gravity fed filter system. Also consider extending the pond up, above grade. This helps in a number of ways including hydrostatic pressures, lessoning of blowing debris into the pond, etc.

There are some pressurized prefilters on the market that you can look at including ones from William Lim and another from GCTEC.

Steve