Thank you both. I just came back from the pool store. Although my pump is technically AG, he used it in many installs with longer run and higher lift, including solar panels on the roof. He suspects that pollen is clogging the cartridge and hosing is not enough, so I'll try soaking it for a few days. Since this is coming from a guy who would benefit from selling me a new pump and filter, I'll follow his advice for now.
But I'll keep your suggestions as plan B in case plan A doesn't work out.
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