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Does anybody have real-world info on how well a low-ambient heat pump (e.g. the Hayward HP21404TC) actually works? The brochure indicates it will kick out 85k BTUs/hr at 50° and operate all the way down to 40°. But I'd like to hear from somebody who lives in a cold-ish climate and has had...

I know this is a very old thread, but it ranks highly on Google so I wanted to add a correction: The BTU->W-hr conversion above isn't apples-to-apples for a heat pump heater. Heat pumps produce more heat than their input energy, based on their COP (Coefficient of Performance). So if your heat...

Thanks! I'm using K-2006C, and I've added it to my sig. So you're saying I can still swim if my FC at the "Shock FC" level in the Chlorine/CYA chart? What is the upper limit on FC that is safe to swim?

Hi all - I got my pool installed a couple weeks ago. I haven't shocked it, but I have added stabilizer and chlorine. Do I really need to shock it? It's nearing fall up here in MN and I don't want to lose 5 days to a SLAM when I'll be shutting it down so soon anyway. Here's the timeline of...

Hi - thanks for having this great site. Very informative. My wife and two kids (ages 1.5/3.5) looove to swim so we're thinking about installing a pool. I'm joining to learn more information so it doesn't turn into a debacle.