A friend suggested Water Guru. We had pool service for quite a while as the chemistry part of pool ownership seemed something we didn’t want to mess with. After 2 months of accurate pool measurements backed up by our local Pool service company chem testing we moved to our own full care of our pool. Water Guru gives us EXACT detail to what’s necessary for proper water balance, what is needed and how much according to our pool size and equipment. No color testing strips, no cloudy water errors. Our pool water is sparkling clean, beautiful. Worth EVERY PENNY!!