Let's start here:
Do-I-Need-a-pH-Meter-(Am-I-Color-Blind?)
If you get the K2006, you can do the chlorine (red to clear) and CYA tests (disappearing black dot) if you can see black and white only. The pH test does require color perception, but if you DO need to order a pH meter, let me recheck sources before you do so. Anyhow, do get the K-2006. She can do the alkalinity and calcium tests for you, if they are needed, which won't be too often on an Intex. (See the test kit page in my signature)

Next, check your sand levels, and make sure the filter is full.

Once you've done those things . . . we can talk about using floc. But it's a tricky process, and you'll need to get testing down, first.