Hey George.
I have the ASM 80. Mine is inline to my remote sump on a very slow flow rate.
Make sure you plumb it so you can easily slide the bulbs out. And also so you can slide out the Quartz sleeves. They need to be vinegar bathed every 4-6 months. And they are very very delicate, so you need plenty of room to slide them straight in.
Also if you are using a controller (like an Apex) to run your system, put the UV on it and shut it down if the temperature gets too warm in your system. The UV acts like an inline heater. Most people who have the ability forget to include the UV in their equipment list of things that can be shut down when the temperature goes up.