"~ jan JJsPond.us" wrote in message
...
Alternatively, if you're using one of the retro-fit drains that sits on
TOP
of the liner instead of through it, it will be powered by a pump, so a 2"
drain can be used.

I use one of these drains, and it uses gravity feed to the filter, not
powered by the pump, and I've seen thru the liner one's powered by a pump.
So I'd say it's the designer, not the drain type that configures the
situation. ;o) ~ jan

My bottom drain is plumbed with 4'' PVC. My home made diffuser has not yet
been installed, so right now all the BD does is circulate water. It has not
done much to remove debris. As soon as the water warms up, I'll be
installing the diffuser.

My plumbing is 'thru the liner' and I use a Bickal Boot. Admittedly, the
clamp I purchased was too small, so my bottom drain is just pipe through
line with the boot, no clamp, no leaks.

--
BV.
www.iheartmypond.com