I'm currently testing my pool water and trying to get caught up with learning about it in Pool School.
1. Do I need to also test my spa separately, or since the same water flows through both my pool and spa, do I just focus on the pool?
2. If I do need to do separate tests for the spa, do I just calculate the size of the spa and run the same tests that I would for the pool?
3. I also have a large fountain that I was previously just pouring chlorine into, though now that I am learning about all of this, I am realizing that it too can be affected by CH, PH, etc. (the inside looks like it might have some scaling effects going on) If I want to test the fountain would I simply calculate the size of it and test it the same way as a pool?
Thanks in advance.