Pentair Tagelus Sand Filter

Help me - I have a 35000 gallon inground pool - the sand filter has a crack - failed on repairing. My guess is it is a TA60D. I need to replace - Is the TA60D the right size for my pool? Can I go smaller? I found a tank that looks to be 21 inches wide - diameter. Is that too small?

The TA60D is a little undersized for a 35,000. If it were my pool, I’d bump it up to a TA100D. The main reason is so that you wouldn’t have to backwash as often.