I just added a couple inches of water to my 18’ round AG pool from our well. The whole pool was filled with well water originally and of course we shocked then. But I’m wondering if I need to shock anytime I add water (since it’s from the well) or if keeping it balanced as usual is enough when onlyadding a few inches? When filled to capacity it’s a 6000 gallon pool. Have an Intex Sand Filter that keeps it very clear.