AquaChek 541640A Select Refills Test Strip for Swimming Pools

I have been using test strips for years now and this is the first time I received a bottle with an expiration date that had passed. I contacted the seller (Pool and Spa Flow) and they responded within 24 hours saying they would ship a new one out after I sent a pic of the bad expiration date. Almost immediately after, they shipped me a new bottle and told me they cleared out any old bottles from their inventory. Customer service was quick and courteous! Will continue to buy from them. As far as the product, I will admit I don't use it with the app but just as strips. They are great for a quick, relatively accurate test. I wouldn't rely on them for exact results - I still take a sample to the pool store once a month for that but it tells me close enough to determine if I need a boost on certain pool chems or to turn up my chlorinator.

Use it all the time to monitor my pool chemicals

DO NOT BUY!!! Useless strips with no colour chart. May as well throw tea leaves in your pool or spa and try and read them. Grrrr

I purchased these because the slightly cheaper ones I bought at the store weren't giving me the right readings. No matter how much PH+ I put in the pool it never changed. So I doubted everything else. When I purchased these for cross reference I saw right away the colors were darker. And the hardness was much easier to read. The bottle congress with the chart so there's no need to buy the other one they have unless you want the plastic sleeve that connects to the bottle to place the chat in. I've had these for a couple weeks now. Yesterday I went to the pool store completely confused how my entire pool went from sparking clear, to green in just an hour and a half! I doubted the strips. So they did a water test in a machine connected to their computer and it gave me a read out. Every result the computer gave me was almost exactly what these test strips told me. I am very impressed since so many pool stores will tell you they are junk. This pool store actually promotes buying these exact strips. HOW TO USE CORRECTLY: They told me to take a bowl and dunk it down into the water about half your arms length and place the filled bowl on the counter. Then dip the strip in the bowl quickly. For half a second. NOT 1 or 2 seconds. Doing more than 1/2 a second will dilute the pads too and remove the chemical on the pads and you will get the wrong color. EDIT: I shocked my pool last night after getting back from the pool store so the chlorine levels won't match the paper they printed. I took the photos this morning.

Great system I enjoy to do the test. Which I really do when I have to compare strips to charts.