Oh, I'd be THRILLED with +90% coverage. Right now I'm getting less than 20% coverage...complete waste.

I sent it to SmartPool, the authorized repair center.

Yeah, it'd be nice to try it in somebody else's pool, or somebody else trying their Dolphin in mine.

But it is my belief that these odd pH numbers they demand are merely a cover for other problems. Of what use is a pool vacuum that demands you adjust certain numbers to a VERY small range, that is outside of the normal range?

I don't like when EVERYTHING is "user error" and the manufacturer demands that you meet an outlandish, quixotic set of requirements and "that's what it's designed for!" I'm not wearing a tinfoil hat, scattering rosemary and marjoram at midnight under a gibbous moon to get the d*** pool cleaner working! I feel like I'm trying to get service from Groucho Marx!