How do i remove the impeller from a galaxy 23 pool pump

remove the motor from the wet end of the pump remove the cover on the impeller then remove the impeller screw it it normally backwards thread then spin off the impeller this has a regular thread split the motor from the backing plate then remove the seals and replace with new ones then reverse process

Over time it will attack the motor, yes. There are pumps especially designed for salt water pools, with 316 stainless steel parts, and an open section in the casing between impeller housing and motor casing, and seals on either side with a flinger on the shaft. Eventually though the salt will get to the motor somehow. Mind you we are talking years. On my salt water pool, now 23 yrs old, it is on its 3rd motor, which is about 5 yrs old.

look to make sure there is no ***** in the center of the impeller, if so, it loosens to the right. the impeller will come off by turning it to the left (facing the impeller) if you still have trouble with the impeller, search your area for your ''local pool pump motor repair guy'' with free testing.
he should be able to save the impeller and install a new seal for around $20.
remember to prime the pump with water after any repair !

Turn off the system at the breaker,
Undo bolts for housing and separate the motor from the pump to access the impeller. Some styles of motors have a screw that is reverse threaded holding the impeller in place, if it has one , remove the screw. Once you have access to the impeller you can use a big pair of channel locks to turn the impeller. Take off the back cover of the motor or remove the plastic or metal cap that is covering the shaft. Use a wrench to hold the back end of the shaft as you unscrew the impeller.

i think they screw on and the screw only locks it in place

Just fixed two myself. One I caught early enough - not too much collateral damage. Both needed the mechanical seals on the pump replaced and both needed new impellers (damaged due to heat build up when seal went bad. Impeller cost at pool store is about $23-$28. Seal at pool store is about $10. Of course, both can be had cheaper online if you can wait for them to be shipped. Easy job really.

If yours has been running a while in this condition, you probably have toasted your motor bearings. They too can be replaced somewhat easily but if I were you, call a local electric motor repair shop to have them inspect and repair, as necessary. Will probably cost you $50-$75. Still, cheaper than purchasing a whole new pump

Might be a screw in middle of impeller with reverse thread. If so, remove. Remove back cover of motor, hold center shaft with wrench and unscrew impeller from shaft.

First, separate motor and pump. Remove back cover of motor. Drive shaft of motor either has a slot on end for a large screwdriver or a flat on it for a wrench.(usually 7/16) Hold shaft and unscrew impeller.