you might have to reconfigure some plumbing just because of physical difference in your current pump vs a new one. Plumbing is so easy though. If you can measure, cut and glue...you got it made. But then again, maybe not. Here is Hayward 1 HP 2 Speed pump.
http://www.inyopools.com/Products/02201170001134.htm
Note- no endorsement given for the this webisite. Its for reference only.
On High Speed, the motor runs at 3450 RPM pumping a full flow rate of water
On Low Speed, the RMP is cut in half to 1725, and you get half the flow... the sweet part is that at slow speed, you only use 1/4 of the electiricity as on high speed
The two speed pumps are 220V just like you have now.
If you are using ab automated system of some sort, you will need to run 1 more wire from the controller so you can select between high and low speed.
If you dont have a auto controller and only use a timer (or not), then no extra wire is needed.
You have to be careful when ordereing, and make sure you get a pump with the speed switch already installed on the pump. (they come with and without the switch installed).
guys, thanks for the expert advice !
What two speed pump should I get?
Does it take different wiring, I am on 220... now. I am worried if I change styles I will need to replumb my lines.
thoughts- how does two speed work?