Your CYA is a bit high and replacing up to half the water would make things a little easier. Although you could manage with the higher CYA ... just means your required FC levels are higher.
No more "bags of shock" or tablets as they may raise your CYA even higher.
So, you have to decide if you want to replace 1/3-1/2 the water first,
OR
just start to follow the ShockLevelAndMAINTAIN Process now.
Actually the first step should be using borax to raise the pH up into the lower 7s.
Use PoolMath to calculate dosages.
No more "bags of shock" or tablets as they may raise your CYA even higher.
So, you have to decide if you want to replace 1/3-1/2 the water first,
OR
just start to follow the ShockLevelAndMAINTAIN Process now.
Actually the first step should be using borax to raise the pH up into the lower 7s.
Use PoolMath to calculate dosages.