Pentair R161025 No.2 OTO Solution, 1-Ounce

Nice because it is a larger bottle

When I replaced a smaller pool with my current 4x16' above-ground frame pool, I researched pool maintenance and came across a convincing site that said all one needs is liquid chlorine bleach, conditioner, and test kits for both.I already had a Pentair chlorine/bromide and pH test kit, so although it's super basic (don't know the free vs. whatever the other kind of chlorine is), I stuck with it so as not to spend a lot of money on a better one. When I used up the little bottle in the kit I had, I bought this one. It's too big to fit in the box, but it'll last longer.The "system" is working so well that I thought this product was broken because it always showed the chlorine in the good range, but I tested it on plain water and it showed no chlorine, so I think all is well!

Use it to diagnose well water that should have cl2 feed... I add a couple of drops in a small white cup and look for yellow! Easy

As advertised, well packed, zip lock bag, shrink wrap at neck of bottle/cap, and 11/2024 expiration

This works and is accurate. I compared it to my digital free chlorine tester and it matched. This is an inexpensive way to keep track of chorine levels.

Pentair OTO solution is excellent to test chlorine levels daily! Quality product and provides color intensity representing chlorine levels in spa.

This item exactly replaced the empty bottle in my Pentair kit for testing chlorine and pH.

Don't buy this unless it's an exact replacement of what you already have.I didn't know it and Pentair had no technical info to share with me on using itVery dissappointed