Russell, sounds like things are under control. No need to shock if you have no CC and the FC is holding. I would suggest making use of the waterproof sheets you recieved with you PS234 to track the increase in cya. 80 is the low end of alk for both your pool and the SWG, if you want a 'comfort zone' add some baking soda, so you have 'room to play', or a margin for error The only other thing to look out for is someone doing a 'cannonball' on you while you're swimming in your pool