Salt Chlorine Generator + 2 speed pump

[Poolsean]

Who's and what horsepower pump? It depends on what the low speed flow rate is. Most systems running with a flow switch protection will require about 15 - 25 gpm flow. Most systems with a gas trap should not have a problem with low speed of a pump, provided that the air is completely evacuated and that the hydrogen gas generated by the salt system is also compeletely evacuated.
Otherwise they will all shut down production when flow is insufficient.

[jabre]

Sean, I have a Challenger 2/0.33 HP with a 30in sand filter. The two speed motor is non-standard so I have not been able to locate a flow rate graph for it. This pool is over-designed for low head - I'm running about 2PSI of pressure at the filter at low speed. I'm planning on hooking up a flex pipe to a return and measuring the GPM by timing the fill of a couple of 5 gal buckets. Interestingly there is always some air in the pump when running at low speed. Sand filter does not have an air bleed valve - I've been told it's unnecessary. Thanks for the info -

[Davenj]

I have a 2hp 2spd Northstar. On low speed with all valves open I get insuffecient flow on the Autopilot. I reduced the flow to spill over spa, swimout, step jets with the valves until the flow light goes out. Marked all the valve positions and return them to these positions when I'm done running different things. Took a little time setting the valves for the flow I wanted at the different places. All in all everything works very well.

[folsompool]

I have a Sta-Rite 2 speed pump with a Pentair IntelliChlor SWG and do not have any problem with flow. Make sure the electrician wires the SWG to run on low speed instead of high.