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I too am in Central MA and will be using the same builder. We're planning on next summer (June 2015). Researching like crazy on line and found this thread/site. We're looking to do pretty much the same set up you did (18x36) with slight differences with the filter system and no heater yet.

I too am in Central MA and will be using the same builder. We're planning on next summer (June 2015). Researching like crazy on line and found this thread/site. We're looking to do pretty much the same set up you did (18x36) with slight differences with the filter system and no heater yet.