I use hydropower often, works great, this year I started refilling my own bags with bulk resin, saves huge $$$ doing that, seems to have lasted longer per bag too, high tds here in northwest BC 120- 680.
Used old bags of resin at my dads house, 20ppm hose water, hydropower went back to 0 even with old resin.
Although, mine currently has a duck taped handle from a fall, and leaky fittings, the top quick connect broke, and was a pain to find replacement. Plastic parts all round are disappointing for the price point...
I do get funny looks from every house using it, until I explain the science behind it, and that I'm not just spraying hose water on their home. Looks legit pulling it out of the truck and telling them about the water quality they have.
No problems with flow for me, I only have 30ft pole.