Back in 2011 I replaced my old 2hp pump with Whisperflow 1 1/2 HP, 2 speed (above). At first, low speed worked with the cleaner KK because at the same time, I installed a brand new filter. After the filter (cartridge) got older and even after wash, the flow was not as high as when it was brand new and the KK stopped working. Since then, I had to use full speed. As you can see the chart above, it was either too low at C curve or too high (may be) at H curve.
Now I am thinking about the a single speed that is just enough to work the KK and save energy as much as possible. I looked at the Amp rating I was confused as why single speed pump has 2 ratings. Here are my questions:
The two amp ratings on the single speed are for 120v and 240V?
Which one of the single speed above should I get? They are in the E, F and G curve which seems much better than C but i am not sure if sufficient enough to run the KK. But the amp rating on the 2 speed looks quite low, too so I am not sure if I will save anything or worth buying a new one. I can always use the 2 speed for my fountain, or spa if I buy a new one so it wont be a waste. Anyone has one of the above single speed pump that work with the KK through a 420 Sq ft cartridge filter?