As long as the fish are used to frequent/large water changes, then no, there is no problem, but as previously stated the water needs to be treated with a dechlorinating product such as Prime.
If it has been a while since your last water change, then you don't want to do a sudden large change because it can shock the fish. Start with infrequent small changes and work your way up. I used to do 80% changes every other day on my goldfish tank but have cut back to 60% twice a week.
Kristina