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I have a few comments on this topic. 2 speed pumps were invented for hot tubs because you didn't need much circulating flow and you did need a high power main speed for spa jets. They are just a full sized pump running at half speed. They end up operating efficiently at low speed if the...

Its clear to me that your solar is all plumbed 2" and your vacuum breaker is at the top so the only thing keeping the pressure on the vacuum breaker above zero is the restriction to flow through the 2" return pipes back down to the pool. With your pump change that flow is reduced and so is the...

Looking closer at the above...I'd have plumbed the solar panels in parallel not series. We see this all the time with Heliocol systems. Like my last post though. As long as you can move enough water thru them without causing too much pressure drop (load on pump) then its fine. I'd guess that...

Chris, You asked me all this by e-mail and I suggested posting to a forum and it looks like you've received a lot of help already. Sometimes after reading www.h2otsun.com people come away thinking solar is a lot more complicated than it needs to be. There are some shortcuts that might help...

Solar expert here. If you're using the pool summer only then the sun is very high and north facing is OK. If you're using a cover then solar won't help as much. An uncovered pool needs heat even in mid summer. One poster suggests flat on the ground but beware. Rigid polypropylene grid style...

The way you need to think of it is less linearly. A vacuum breaker breaker the vacuum. In other words when the pressure at the vb location goes below zero the vb opens and lets air in. That breaks the vacuum. The reason we want to break a vacuum is that in a solar heater its a black thing made...