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I agree with Mike. In our area, we are blessed with great water. So massive water changes on a regular basis are good. and cheap.
But in many other areas, the source water sucks.
Now, if you dont change your water for quite some time, your source water will differ from what is in your pond quite a bit. Any differences will stress your fish. Temps, KH, PH etc etc. All those parameters should match up pretty close to what you are putting in. If you instead do 10% a week, instead of 50% per month, the water changes will be more subtle, and not stress the fish as much.
So rather than massive water changes, do smaller ones more often, The fish will love you for it.
As for buying one of the Oase 3, not all ponders can afford to have that type of expensive equipment around to only use it once or twice a year. Or even 4 times a year. It is a very large outlay in resources. We rent ours out for $35 a day, and have 2 that we sell off each year to local customers that want the used ones. Have a waiting list two years out for the used vacs.
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