raising alk?

Thanks for all your help. What are the consequences of leaving my alk at 240. As I understand it, it will help my pH stay steady but there must be other issues. I'm new to this pool stuff but this site is a great way to learn and all of you are great help and I appreciate all your input.
Thanks,
Dave

PS my numbers as of today
fc 3.5
cc 0
tc 3.5
alk 240
cal 170
cya 30
ph 7.5
temp 64
water only slightly cloudy but I can easily see the bottom and pattern on the liner of my 30' round AG

Hi Dave,

I just joined the forum yesterday and am still learning, but am working on a similar issue. My understanding is that if you have a heater or plaster (or both), you want to keep your Alk in the 80-120 range because scaling happens at higher levels. I believe the range is higher for vinyl pools, but I have plaster, so I didn't commit that to memory. Check out the "How to Lower your Alkalinity" sticky--it's very helpful.