Hello Billert and welcome to Pond Boss. Wow we are seeing quite a few Canadian pond meisters sign up lately. I'll let the pond guru's answer your question. This is a fantastic site and don't hesitate to post any and all questions. We're glad you found us.

JHAP
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"My mind is a raging torrent, flooded with rivulets of thought cascading into a waterfall of creative alternatives."
...Hedley Lamarr (that's Hedley not Hedy)