Just checked my water after these strips arriving through the door and I was very very surprised. No chlorine pretty much.
High Alkalinity, Cyanuric Acid and Hardness.
I think the Cyanuric acid is like a bleach. So I'm going to see if my Eco thrive Neutralise works to kill this out the water.
I will update with a test after I've added the neutralise and also after adding a little apple cider vinegar, which I like to use to pH the water.