My calibration is still very good after 3 months. The geared (step down) motors don't vary much.Very cool man. I hadn’t realised
Those peri pumps got so inexpensive.
Have you checked calibration any in the last 2 months? How fast is the flow on those?
If it ever does go off calibration my sensors will pick it up.
I built a DIY Doser using the small 6 Volt Peri's like 2+ years ago. Never need to calibrated it since installed.
For the Irrigation version I used on WC...Look at the Spec of the Pump at the bottom of the Sales Link I provided.
There are a few choices (Depending on the tubing diameter). Flow ranges From 350ml/min to 550ml/min. I got the 550 version for my Water Changer (Quicker is better, and accuracy within spec)
The one's I showed are the High Volume/LongLife Peri Irrigation Pumps (why good for Water Changes).
Typical Kamoer DC Volt pumps for Dosing can run you like $9 each.
Of course you can get Super Accurate Stepper versions, even better than in the DOS for like $200 a pop.
Check out the Massive Kamoer selection here https://www.aliexpress.com/wholesale?catId=0&initiative_id=SB_20191114185352&SearchText=kamoer
(But always wait for a SALE if considering a purchase. They go like 25%-30% off minimum) You just missed 11/11 sale.
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