You really should get both that I listed. The FAS-DPD will be needed because it measures the chlorine in your pool in a way the other doesn't. Reread what I said about it before. Expect the FAS-DPD to last at least one season, mine lasted two but my pool gets light use.

The 7 way has various chems in it which can be replaced individually as needed. They're usually 6 or 7 bucks each. Most likely you'll have to replace the CYA test before the end of the season. The others will likely last an entire season.

And like Watermom sez, read, and read thru this site. There are lots of people with smaller pools than your and even less pool knowledge. And then there are some here who can talk chemistry and pool water science and pool construction with the best. That's what makes this site so valuable. No one's here to sell you anything except the cheapest way to maintain your pool.

Take a look in the "Off Topic and General Interest forum". The first four discussion areas are where everyone posts pictures of their pools. You'll get a good idea of the range of people who come here and the range of pools they own.

And notice how clear their water is too.

C.