Hello all! Thank you in advance for you help.
Two years ago I purchased a SHURflo diaphragm pump (model # 2088-474-144) to pump water out of my pond and up 30 vertical feet to a tote from which I gravity feed my 3-acre forest garden. When the pump arrived with a plastic guard broken, the company sent another free pump. We set up the pump to run on an altE 110W solar panel, a a water filter attachment, and a linear current booster, and ran the pump only when it was very sunny and not very often in general (about one day out of every two weeks in the summer).
The system appeared to work perfectly, but after about a year the first pump failed without any clear explanation and a year later, the second pump (we were able to use the pump with the broken plastic guard, after all) stopped working as well. We have gone through all of the troubleshooting recommendations - in the case of the second pump, each of the troubleshooting efforts would make it run only a short while before it stopped running again. It seems ridiculous to go through one water pump per year, so I would love to hear people's recommendations for durable, high-functioning water pumps. I am happy to spend more money on a pump if it will last for longer and be of a quality that allows me to reliably repair it or have it repaired.
My initial research into water pumps made it seem that diaphragm pumps would work best for this type of low intensity pumping, but I think now that centrifugal pumps might make more sense given that they have fewer moving parts.
I very much look forward to hearing people's thoughts. Thank you!