Is Hayward C7030 too big for a 20,000 gallon pool

[pumpkineater59]

We have a 20,000 gallon pool that was remodeled 10 years ago. As I want to reduce maintenance as much as possible, we put in a Pentair Tritus II Tr140 sand filter. It has served well from a maintenance perspective. It has developed a crack, so sand gets in the pool. Also time to replace the sand. Due to all this but also wanting to reduce water consumption (live in southern CA), I've been looking at Hayward cartridge W3c5030 525 sqft. Again, I want to go bi to reduce the time in between cleaning the filters. I just found a deal on Hayward's biggest cartridge filter C7030. I read somewhere going bigger increases the time between cleanings.
Is 700 sqft cartridge too big, meaning in will not function well for a 20,000 gallon pool. If so, is 525 sqft a better choice? Hoping to get some practical advice. Thanks in advance.

 

[ajw22]

Get the 525.

You can't go too big.

 

[pumpkineater59]

Would you still go 525 if the 700 is $300 cheaper?

 

[ajw22]

Would you still go 525 if the 700 is $300 cheaper?

What is the difference in replacement cartridge cost?

Look at life cycle cost, not just acquisition cost.

 

[pumpkineater59]

Thanks for pointing that out. It's 8 vs 4 cartridges. Using a single site and comparing cartridge price, it is almost $200 more for the c7030. That helps making the decision to go with the 525 sqft model.
Thanks all for answering!