Does anyone on here have experience of autovax?

It appears many pubs including, so I have heard GBG pubs, are using this system where slops in the drip tray are syphoned back into the feed pipe and served again.

If a customer has lemonade, lime or any other stuff in their beer, that can spill over into the drip tray, and the beer can also wash the servers hands into the drip tray, staff taking beer from the next handpull could spill that beer into another drip tray, and it could be a mecca for flies. I presume there is a filter on the system to prevent any dead flies getting into the feed pipe. Reused glasses could contaminate the beer.

It puts another slant on the expression often heard, "That's the way the brewer intended it to taste". Surely fresh beer is what we all want and deserve for our money.