Chemistry is
Ch 1-1.5
FC 2
TA 150
PH 8.4
Calcium 400
CYA 140

Before the readings above the pool was nearly at the dot with PH 7.6, TA 90 and CYA at 80. algae is like very light greenish type along the pool lines. Using algaecide will help if I am away for 3 weeks with pool being closed? Thanks