The concept of walk-in pool water testing is great. Unfortunately, there is great inconsistancy from store to store. Store #1 told me my salt pool hardness was so high I needed to drain my pool and refill. Reluctant to accept this at face value, I went to store #2. They don't have a hardness test. Store #3 tested my water and told me it was well within range. Just to be sure I went the a fourth store and they also confirmed my pool water was well withing range. read full review »