Im ordering a new salt cell for my pool 25000 gal pool with Hayward Tcell925. Would I be able to SLAM with the salt cell if I ever need to i

Assuming good chemistry management, you should never need to SLAM.

If you get bad algae, then you need liquid chlorine.

For a minor amount of algae where you need to maintain a SLAM level, you might be able to maintain with the SWG after you raise the FC to SLAM level with liquid chlorine.
 
If you were to buy the IC60 instead of the IC40, it would be like buying the IC40 at regular price, plus an IC20 at 69% off. The maths works WAY in your favor when upsizing.

The IC60 would Lol at your northern UV demand and need 50% less runtime to produce the same FC. It would save a chunk of electricity if you have a SS pump, or still be helpful if you want to run your VS pump less.
 
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