this is the one i have:
https://tftestkits.net/TF-100-Test-Kit-p4.html
i also have a speed stir, which makes this insanely easy...it's much easier to let the magnetic stirrer mix things up for you and just worry about counting the drops rather than trying to swirl and count at the same time. it sounds silly, but trust me it makes a difference...
My only advice after my first 5 days is to purge with ahh-some when you first set up the tub for sure, and also that this tub sits on the larger end of what the frog@ease cartridge seems to be able to handle. Even at a setting of 4 it's having a hard time keeping to .5ppm free chlorine. I will report back after more experience. This tub is getting heavy use with 2 person morning sessions of 30mins each or more, 3 person afternoon sessions of 30mins, and 5 person evening sessions of 30 minutes.
One recommendation that I have is to get a taylor k2006c test kit, as it's vastly more accurate than the strips, however with ANY test kits you get, you will need to ignore combined chlorine on the tests when using @ease. This thread at TFP explains (a lot) more.
I highly recommend reading this: https://www.troublefreepool.com/threads/jumping-back-in-bullfrog-a5l-with-smartchlor.186281/
Test Kit I am using (i got mine cheaper @ebay but amazon has the reviews):
Amazon:https://www.amazon.com/dp/B0002IXIJ0
Ebay: https://www.ebay.com/itm/402335621331
Also a stirrer is super helpful with titration kits like the Taylor kit: https://www.amazon.com/Magnetic-Stirrer-Speedstir-Start-Up-Batteries/dp/B004BGPC5W
I find ALL color based pH tests hard to read, and I find the cheap 12 dollar ph sticks on Amazon don't last long when testing things like Chlorinated water, and they don't like getting wet. This pH tester is an Amazing consumer grade electronic option that I am loving for Saltwater fish, the hot tub, and my plant watering testing:
Apera pH meter: https://www.amazon.com/dp/B01ENFOHN8
I also ordered a Cascadia jet pack for the waterfall since mine didn't come with one.
Good luck!
buckets of hypochlorite
You'll notice that powdered chlorine is missing entirely from my kit below. That's because when it breaks down, it leaves behind sodium and calcium- both of which I don't care for in my not-hard-water pool. In it's place, I use liquid chlorine because that breaks down pretty cleanly.
Here's my as-cheap-as-I-can-get kit:
For easy ongoing monitoring and reminder alerting via smartphone (also comes with known-to-be-somewhat-inaccurate calibration test strips): https://iopool.com/en/
For complete & accurate periodic monitoring: https://www.amazon.com/TAYLOR-TECHNOLOGIES-K-2006-CHLORINE-FAS-DPD/dp/B004BGF7TI/ref=sr_1_3?keywords=taylor+pool+test+kit&qid=1665312351&qu=eyJxc2MiOiI0LjA4IiwicXNhIjoiMy43MyIsInFzcCI6IjMuNjIifQ%3D%3D&sr=8-3&ufe=app_do%3Aamzn1.fos.18ed3cb5-28d5-4975-8bc7-93deae8f9840
To make the periodic (month+) monitoring go a little quicker and easier: https://www.amazon.com/gp/product/B004BGPC5W/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
For my 17k gallon pool, it's 2 pucks and 1.25gallons of liquid chlorine per week (often week plus a few days). So simple and that takes care of shock and ongoing chlorine consumption. Rarely do I ever use ph up or down so I keep very little of that on hand.
With one exception, for chemicals, additives or treatments, I use nothing beyond what is listed above. Very rarely if there's some funky need for additional/different shock treatment, I'll use 1.5lbs of Non-Chlorine Shock Oxidizer (Potassium Monopersulfate). This is usually sold in small packets for spas at Walmart and at pool stores it is NOT cheap.