I’ve lived in AZ for over 40 years and always had a pool and a pool service. Recently retired and was unhappy with my current service so looking forward to taking care of my own pool. Had my water tested and was advised to drain because of hardness. I drained about 90% and am refilling now. Any help would be appreciated. Thanks. I have 1 year old plaster and filter and a 3 year old pentair pump.