Okay, here is what I managed to find out. We have Intex Filter/Pump Model 637. On the Intex site, it says both 800 GPH and 1000GPH, so not sure which is truly right. According to their site, it has 1 & 1/4 inch hoses. The filter it uses is Type A, which is 4 inches in diameter & 8 inches tall.

The 2500GPH pump is model 633T (with timer). It uses 1 & 1/2 inch hoses, so we would have to get an adapter, I believe. Here is what Intex has to say about that.
http://faq.intexstore.com/faqsup/pub...15&frmcontact=


This pump uses Filter Type B (I believe) which is 5 & 1/2 inches in diameter and 10 inches tall (so it would be 2 inches taller & 1.5 inches wider than the one we have now).

The timer would also be helpful for our upcoming vacation.

What do you think?