uv sterilizer

What is everyone using here? I'm looking for something in the range of 600 total volume. Any recommendations?

I've been searching for an inline flow meter that uses 3/4" barb fittings to connect to vinyl tubing. I want to have one directly after each of my 2 UV sterilizers so I know the flow rate going through them. I just ordered 2 Sicce Silent 3.0 pumps to feed each 25 watt sterilizer. I'm trying to...