If you are not getting debris during normal use, then all you need to do is ensure you sterilize it before use. Hook it up to your pump 15 min before the end of boil and recirc it without the cooling water on back into the kettle. You will need to throttle the pump back with the exit valve to...
For me, it was calcing pitching rate and making a starter for yeast health, oxygen using a stone at transfer, yeast nutrient in the boil and fermentation temp control with fridge and stc-1000.
You need a grant. I use a grant to gravity feed from the math tunnel without pulling on the grain bed with a pump. In the grant is a double float. The bottom float shuts the pump off for 30 sec, the top float shuts the valve to the mach tun. I turn it on and walk away.
I would also recommend you add a tee and another hose and gas fitting into the line to allow you to keep it on the gas on the keg and give you a second gas source.
Actually, the main concern should be oxidation, not contamination with beer. The high alcohol environment is toxic to most all bugs. I simply swirl with sanitizer and drain. Then purge with co2 and transfer closed.