View Full Version : Testing question

03/20/2017, 10:15 PM
If I do a water change how long should I wait before testing??? Is it the same as if I dose say calcium and wait 8-12hrs before taking a test or am I ok after a good 1/2hr of mixing? After all there isn't anything to settle.

I'd like to have the most accurate results I can.

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03/20/2017, 11:49 PM
Dosing or water changes either or 2 hrs should be plenty of time to test. Most are turning 20-50times the volume of water in 1 hr.

Ron Reefman
03/21/2017, 06:26 AM

It depends a bit on the turn over in the tank, the turnover from sump to tank assuming you have a sump. In most tanks water is mixed much faster than you would imagine. IMHO, 30 minutes is more than long enough unless you have really slow turnover.

03/21/2017, 08:33 AM
At the moment I have no sump and am about 35 times an hour.

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03/21/2017, 09:21 AM
So the tank turns over every couple minutes. Just do your additions in a high flow area, and it shouldn't take much time for everything to thoroughly mix. I would think a half hour or so would be plenty safe.

thirsty saltine
03/21/2017, 06:40 PM
30 mins to an hour and you should be set.

03/22/2017, 02:22 PM
Test at every 10-15 minutes until the results stabilize and then you will know.