Our pools have in-floor cleaning systems -and that means a lot of underground plumbing! Why do we use in-floor, especially if we are in Michigan? Heating the pool from the bottom up is very efficient, as both chemicals, and heat can add and circulate from the bottom. This system also allows the pool to clean itself by directing dirt and debris to the large main drain at the bottom of the deep end. Many people wonder if this type of underground plumbing is safe for the Michigan climate, and it is! As long as the pool is winterized properly, there is no issue with having an in-floor cleaning/heating/efficiency system on Michigan swimming pools!