My salt water gunite pool is 30k gallons with a above level spa which has two waterfalls into the pool. I have been fighting scale and ph creep all summer. The deck and the spa are finished with stacked stone and mortar. The scale forms ontop of the stacked stone and along the walls of the above ground spa where the fountain of water falls into the pool. All other pool metrics are within normal range. I'm using muratic acid to combat both the ph creep and scale.
Is this normal? Is the calcium found naturally in the stone contributing to my scale problem. Is there anything I can do besides use muriatic acid? The temp of the pool is typically low to upper 80s from early May until early Oct.