Look, the TF-100 is easy. All you do is do one test at a time, following the instructions. We even have videos to show you how to use it.
The bottom line is your pool water is laden with too much stabilizer and too much calcium.
The high stabilizer makes your FC (free chlorine, the cootie fighting stuff) less effective against algae.
The high calcium can coat your walls with scale and makes your water "hard".
You added all this via the continual use of pool store pucks and granule products.
We here at TFP learned that staying away from these multiple ingredient products and just using the single ingredient liquid chlorine, or bleach, gives us FC but *none* of the calcium or CYA we don't want or need extra of.
We don't trust pool store tests because they're done-
A) sloppily, in a hurry
B) untrained worker who doesn't understand the chemistry when making suggestions
C) with the sole goal of making a sale of something or another.
We like to use grocery store chemicals (same ones as a pool store, but cheaper) when possible, and with our test kits we *know* what we need, and what we don't! The test kit is often better and more accurate than the ones used by those in-and-out pool services who come to the house!
You *can* do this! It ain't brain surgery, I promise.

It is just a matter of learning what and *why* you use something in your pool.
Maddie
