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Leaking after refill after being wintered 18 months


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I have a 2011 Master Spa twilight 10 foot hot tub. In October 2021 I dried it out and winterized it by making sure I got rv antifreeze in all the lines. We didn’t use it last year. But today we opened it up then cleaned it out and refilled then drained it to make sure we were dealing with fresh clean water. When I turned on the breaker everything seemed normal both times this afternoon so about 4 hours ago I left it to continue the heating cycle with a full tub of fresh water. Now it’s 1:30 am and I went back out to check on it but it has lost a lot of water and went into dry fail safe on the control panell. I shut off the breaker. I can kind of hear water dribbling but can’t visually see any leaks. I, not sure what else to write… but do you have any ideas? Thanks.

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Well you are going to have to open it up and start digging to find the leak. Some spas have one way check valves installed in the plumbing and it is not uncommon for water to be removed from one side while removing water for storage but water still sits on the other side because the check valve is closed. Not saying this is your leak but I stopped Winterizing spas years ago because it is all but impossible to get all the water out.  

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