Questioning long term reliability/ usability.
Some feedback, I bought the DP-4 in Sept 2014, and it came in about 3 1/2 weeks - no issues there.
Pump 1 was used to dose 1 cup, three times a day (237ml * 3) of limewater (kalkwasser) and Pump 2 dosed 1 cup of watered down Mag from Randy's two part. After about three weeks, pump 1 which had the Kalc wasn't dosing, but making a winding noise. I contacted Fishstreet and after some questions they sent out a replacement pump; standing by their product which is great, as it's the first time I had to get warranty support for a jeabo product. Also, I was dosing the clear Kalc, not getting the sentiment.
When pump 1 went bad, I calibrated pump 4, and set the program in. Today, this morning, I put a 2 cup measuring cup at the output that should have read 237ml, and it only pumped 200ml. Not good. I went to pump 2 that dosed the mag, changed the time of dose, instead of 237 ml, it was 195ml. Also not good.
I calibrated both pumps, and tested, to get what it was suppose to, 1 cup @ 237ml. I plan to test the output now every week as that kind of surprised they went out of calibration after two month and one month of service respectively.
Any other tests 4-8-12 weeks in to see if calibration is still in check? I'll keep everyone posted.