Smart decision to follow our BBB method. It is easy, it is cheaper than pool chemicals and it works!
You should NOT need to change your sand. Sand does not wear out and many of us have sand for a whole lot longer than 7 years.
I am not the pump or gas heater expert so I'll let someone else address those questions.
Go ahead and order a Taylor K2006 or 2006C (better buy) test kit. It won't be available locally; you can click on the test kit link in my signature and order one from Amazon. It will make things much easier for you than trying to get by on a cheaper kit.
Do a lot of reading on the forum, especially the stickied threads at the top of the various subsections of the forum. Also, read over on our sister website www.poolsolutions.com. Lots of good info there as well.
We are glad to have you join us! Let us know if you have more questions and someone here will try and help!
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