First off i would like to say man what a forum. Even though I have never posted on the forum you guys have already helped me a ton.This is the first year of having a pool. My family purchased a home in December of last year that came with the responsibilities of keeping up a 18x36 inground vinyl liner pool. After having an algae bloom already this year and taking the advice on this forum to successfully get it cleaned up I am at yet another crossed road and confused about my CYA level. I have done some reading up on the forum and am kinda familiar with how to take care of the problem but want to make sure I fully understand the process. First off let me say I have a high CYA level. The previous owner of our home had been using stabalized chlorine tablets. When i took the water to have it tested (before i found the forum and bought a test kit) they told me it was at 75ppm. I then proceed to check with my newly bought kit (5-way HTH) and checked to be over 100ppm. How can i manage to bring this level down to where it needs to be. I know I can drain the pool half way and do a refill but have also heard that this is dangerous for a vinyl liner. Second does burn off and splash out reduce the CYA level. I am adding water on a daly basis as we have not had rain in a while. Also I have read about how inaccurate you CYA reading can be unless down correctly. Could someone point me in the right direction of how this is accomplished. Any help is appreciated and thanks for the space.

Test Results
FC= 8
TC=8
PH=7.5
ALK=180
CYA=75 (by pool store) 100+ (by HTH 5-way test)