You might be able to repair it since the PSI is probaly at 15-20, which is relatively low compared to your household at around 60 psi. If you were to repair it, it would be nice if you had a valve between the pump and filter to regulate the pressure in your filter. For instance, my filter typically runs at about 18-20 PSI, but I have installed a ball valve that drops that to anything I want, I typically keep it at 14 PSI making my sand filter more efficient. Lower pressure means less chance of blowing out your repair. I don't have any great advice on how to repair the cracks. I would think the best way is to patch the cracks on the inside with similar material and a strong bonding cement or epoxy of some kind, similar to patching a leak in your pool liner. If all else fails you could still runthe pump without the filter and still be able to keep your water in a "swimmable" state, knowing that dirt will collect on the bottom of the pool. Another option would be to look at a cheaper filter, like sand, not as good as DE but an option.