I always test them. I also ride a bike (motorized or not) with out a helmet, run in the hallway with scissors, drive my car with out my seatbelt on (unless I spot the man), eat medium rare steaks (because their just so friggin' tasty that way). I even sneak a cigar upon occasion. Honest to God I sometimes wonder how mankind has evolved (or not). I must admit though that I won't percolate in a public hot tub (just to creepy) but to test them? With regards on how to clean them - follow manufactures recommendations. If that is not available then put some Cascade dish washing detergent in the tub with hot water (low suds - less cavitation of the pump) run for 10 minutes, drain & fill with plain hot water, run pump for 10 minutes, repeat processes. After that light candles, open a nice bottle of wine and enjoy your new house. And yes, I've actually said that.