| the use of UV is all about respect. If you want your filter to be bombarded with everything in the water column, then do as the westerners and put it after the filters before it enters the pond. That way the koi get all the clean water (LOL)
or if you prefer you can kill stuff before it enters the filter system and allow the good baceria housed there to prosper and allow the over colonization to spread into the pond. ( where 10 % of your filtration is housed )
as already stated continuous running of the UV is best for the longivety of the bulb. Two summer seasons is about all you can ever expect out of one.
UV's are also excellent for those who wish to eliminate parasites in the spring and fall as the water temps run thru the 50's and reproduction is triggered.
My mentality has always been if a pond is properly filtered and maintained you don't need one to maintain water clarity. But here in the NW the springs are long and lingering with cool rains and temps and then when it bursts into instant sun and heat in what seems like overnight. That lag time it takes to have a filter "catch up " is aided with the UV.... |