Quote:
Originally Posted by
schildkoi 
CBRS2K, I copied the below and want to make a few comments.
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First of all, Unless you have an EXTREMELY deep pond, you will not get a "thermocline". Thermoclines reuire depth to occur and in the typical Koi pond the depth simply isn't there and you won't find more than a degree or two difference. In addition, by failing to "mix" the water, even in the winter, you are subjecting some areas to poorer water quality than others. The issue of air to air domes becomes one of where the air is draw from and not whether it is on or not during the winter.
Mike has inserted some very valid points. I've had the same diffusers now for 7 years....never a clogging issue.
Steve