I may have missed it... But rather then worry about remembering to put additive in at the end of the year.... My recommendation is to run additive at all times.
I do this with my boat, jet ski, etc... and then never have to worry, about doing it at the end of the season in time to make sure it circulates through the entire system...
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Life is about how much time you can spend relaxing... I do it on an island that isn't really an island.....
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