I am currently at my wits end with my pool and pool contractor. Every spring when I bring the pool out hibernation I find the pool walls and floor are covered in scale. Not sure what is causing this to happen.
Pool is a 20000 gallon concrete shell pool with a marsite plaster finish.
It is a salt water pool.
It has a auto cover over the pool through out the winter that is not opened for roughly 6 months.
Pool is winterized by my pool contractor each fall.
The water is not circulated in the winter season what so ever.
The scale is strange in that it mostly forms on the bottom at the deep end of the pool and up the walls roughly 4 ft. There is scale above this line but it is less dramatic.
The scale is so sever that I have to drain the pool and sand it down as it will cut swimmers.
The pool is 4 years old and it has done this each and every year.
The scale does not reoccur through the swimming season.
The water is city water and is considered soft water with out much in the way of metals.
Any one else ever run into scale forming in cold water?
The pool shell hangs over the edge of a rock cliff and is exposed to air all the way around in the winter.
Thanks in advance.