Here at Jim's Pool Supply we we value our education and training in proper pool care, including treating pools chemically. We love passing on our knowledge to our wonderful customers so that they can learn how to properly care for their pool too. Our complimentary water testing service is included with the purchase of a sanitizer from Jim’s Pool Supply. We do this to be able to properly serve our customers. Water balance can be complicated and there are usually many factors involved, therefore since we are only trained with the brands of chemicals that we sell, we cannot, and should not, give recommendations for products which we do not sell and are not familiar with. If you are not using one of the sanitizing programs that we offer, we can still help you to the best of our ability without testing the water. We are also happy to discuss switching to a sanitizing program that we offer so we will be able to offer you extensive chemical advice and water testing in the future!