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my point is this. If your doser (of any kind) is telling you you're dosing 10 mil a day of buffer, and your tank is happy with this. One night you decide it's time to calibrate this pump. You calibrate it to find that it was only dosing 8 mil a day not ten. You quickly correct that. Now your...
Here's my take on calibrating dosers, don't.
What does it matter how many ml a minute are coming out ? I just adjust based off of test results. Sometimes I need a little more, sometimes I need a little less. Wether or not it's "calibrated" is this weird sort of variable that kind of doesn't matter.
https://www.amazon.com/Lees-Aquarium-Thinwall-Rigid-Tubing/dp/B07K8XCDSD/ref=mp_s_a_1_4?crid=3JG94U2VNY2TE&keywords=rigid+airline+tubing&qid=1670287292&sprefix=rigid+airline+tubing%2Caps%2C134&sr=8-4
you need this. With a little finesse you can cram this inside regular airline tubing
Kalk paste with an oral syringe. Don't over complicate it. Just get all the ones you can see in one shot, wait a few weeks do it again. You'll never win, you'll just be ahead.