"Lee Brouillet" wrote in message
...
snip
later when you're trying to unclog pipe . . . From what I understand of
your
design, you don't have any shut-off valves between the pond and your
veggie
filter. If you did, you could drain the veggie filter, then open the valve
snip

Funny you mention that...I want to have valves at the end of the pipe, but I
have not seen any at Home Depot for the 4 inch pipe. Am I missing something?

BV.