So over the course of the year we've been remodeling the house and left the pool covered for the season. With winter approaching I'm curious to know if I should pump out all of the now green water remaining in the pool and replace it to the normal winter fill height with fresh water, or if I can just leave it until next year when we re-open the pool.
My primary concern is that the green untreated water will possibly permanently stain the liner of the pool. It's a 10k+ gallon pool and I wouldn't want to open it next season with an ugly green stain stuck at the level the water sat at all season this year.
Is that a valid fear? Or will it be fine remaining covered through the winter with the current water and opened next season without trouble?