UV Sterilizer for top off rez?

I need a way to sterilize my top off rez. Problem is that I'm using hydroguard, so I don't want to kill that off. I noticed that bacteria can form in there and sometimes it goes down the water line and clogs the float valve preventing the system from topping off. I did order a 1/2" valve (vs 1/4" currently) to widen it up though.

So I was thinking of small amounts of h202, or frozen water bottles, but then I remembered UV sterilizers. Does anyone have one that they use for a similar situation? I see I can get one relatively cheap for around $30. Seems like a good way to keep the top off rez sterile and not harm the good bacteria in the system itself. Any thoughts?

why not use hydroguard in there too?

rkymtnman said:

why not use hydroguard in there too?

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Because from my experience it 'grows' or something is growing in there and it creates a mass that clogs the water line float valve and the system does not top off correctly. I have to remove it and clean it out. I did add a sort of filter just now in the bulkhead fitting prior to the water line to stop any gunk. But I also don't want to proliferate any bad bacteria in there and introduce it to the system if possible.

Well, I bought one anyway for $30. We'll see what happens...