How long should pump be circulating before testing?

[mickey4paws]

I've always waited until after the pump had been on for about an hour or two before testing. Now that I have a timer (and my own test kit), I wonder if testing right when I turn the pump on or waiting a while really matters. Will a test on uncirculated water be different than when the pump has been running for a while? Thanks.

 

[JasonLion]

Yes, some of the numbers can vary when the pump has been off. It is good to run the pump for at least an hour right before taking a water sample.

 

[mickey4paws]

Thanks, Jason, I appreciate the reply