RECEIVED PRODUCT VERY FAST. HOOKED IT UP IN NO TIME AS PRODUCT ADVERTISED. I OWN A HOT TUB WHICH HOLDS LESS THAN 200 GALLONS AND IT SEEMS TO BE WORKING VERY WELL! I WOULD RECOMMEND IT TO ANYONE. I ONLY WISH THERE WAS A WAY AT HOME TO BE ABLE TO TELL IT WAS FUNCTIONING PROPERLY LIKE A SELF DIAGNOSTIC CHECKING SYSTEM.