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CoolROD: Consider leaving out the tee, using an elbow or other means to attach the pump to the bottom and letting the UV clarifier be your top or lid to the res.
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Good idea, I thought of doing that at first, decided it wouldn't work. The top of my res will stick through the case, so that I have a fill point that is easy to get to, and is highly resistant to spill damage (any spillage would be outside the case) The inlets to the res will be at least 3-4" below the fill point. If I put the clarifier in the top, it would be mostly dosing the water sitting in the top of the res which probably sees less circulation than any other point in the system. OTOH, if I put it in the bottom, then it sees every drop that goes into the pump. Aside from draining the coolant, (which I'm going to make provisions to do easily) the retrofit wouldn't be that bad - I'd build the clarifier part first, then just cut the old res at the point where it would fit. Should be very straightforward.
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I have also noted the comment about string algae. It may be that this stuff is immobile and never gets washed through the system to see the UV light.
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Thats my guess.
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That is the shortcoming of this approach to keeping a clean system.
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True, but it might make the cleanouts less frequent.
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I don't think that we need "beneficial bacteria" in our systems b/c we don't have anything we want digested.
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Agreed, I just put that comment in as further eveidence that the UV doesn't kill everything, so some kind of biocide would still be needed.
Gooserider