Balancing the water
So it can sit for months without turning or damaging the surface.
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Once water temperatures are consistently down and the pool is not being used, usually well into fall here. Closing while the water is still warm invites algae growth under the cover. Closing after a hard freeze has already hit is too late. The window is wider in Middle Tennessee than further north, but it is still a window.
Some owners do, and it requires actively managing freeze protection, running equipment during cold snaps, and keeping chemistry going all winter. It is a real commitment rather than a way of skipping the work. If you are not going to do all of that, close it.
Earlier than most people think. Opening while the water is still cold means algae has not started, and the pool comes clear with far less chemical. Waiting until the first warm weekend usually means opening a green pool and spending the first two weeks of the season fixing it.
Yes. It is a recovery rather than a standard opening and we will be straight with you about what that involves, which is filtration time as much as chemistry. It is also worth knowing why it happened, because a green opening usually points back to how it was closed.
Yes, and most of them. Tell us the pool type, the sanitizer, and whether there is a heater, and we will bring the right setup.