My Mom lives about a 3.5 hour drive from me...I'm trying to help her convert to a Trouble Free Pool so I want to run a complete test of her water for her. She's driving up to visit next week....if I have her take a sample of her pool water, will it be fine to test 4 hours later once she arrives at my home? I've never considered it, and assume it would be fine, but wanted to weigh in here...