I know this is probably the wrong place to post this but I couldnt see where it would fit....any way,,,,I have had the PS233 for a couple years. And now I see that a new PS234 is out, Is it better then the 233? What are the diffrence in the 2? Should I upgrade? Getting ready to open the pool up and wanna get this kit if it has some things it will do that the old one will not (got to get some refills any way)