I'm running low on many of my test chemicals and while looking online I noticed they sell 16oz bottles. I'm sure this if for the pool/spa pros that use this stuff a lot on several pools/spas. I'm wondering though if these chemicals have a shelf life and if it would be ok if I bought these to use and to just keep the .75oz. bottles full that came with the kit. The droppers of the small bottles come right off and the bottle could be filled. All together buying the bigger bottles would cost me a little over twice as much as the smaller bottles but I would not have to buy test chemicals for years this way, as long as they don't expire. This forum has been a great asset for me in keeping my hot tub, and hopefully someone here will know the answer to this question. Thanks in advance.
Josh