I was in your shoes a while back. I could not keep the pool chemistry in check no matter what. Chlorine/ CYA disappeard over night etc. Ended up replastering last summer, boy what a difference.

FYI I think you meant it was new in 99, not 09.

Cost was $2.5K for 18,000 gallons 33x17 oval shaped sport pool. Plain jane white plaster. Nothing fancy.