How do you get pressboard up

had to pull up the carpet and I was shocked to see that pressboard not plywood was covering the subfloor. it took days to get this stuff off and it was messy and wet with urine due to the sick cat that sadly was in the room and the door was shut leaving him no litter box. what a mess and sick smell. is there equipment that I can rent to get this pressboard up easier something that works because the entire house has this and I think I have no choice but to replace it and bring it up to code. any ideas?
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