Those plastic pools will last longer if you siphon out the water instead of lifting it to dump. Your back & arms will last longer too!
An easy way to siphon is to place a hose with one end at the bottom of the pool, the other somewhere so the end is even a few inches lower than that. A good way to use the dirty duck water is to have it siphon out into a garden or flower bed. Take another hose connected to a faucet and start water flowing through the end of the other hose in the pool. Keep the ends under the water, when the siphon has begun you can remove the hose that's connected to the faucet.
If you have the time, energy & resources to change the water every day that's great, otherwise you can get away with doing it every 2-3 days without too much trouble.
An easy way to siphon is to place a hose with one end at the bottom of the pool, the other somewhere so the end is even a few inches lower than that. A good way to use the dirty duck water is to have it siphon out into a garden or flower bed. Take another hose connected to a faucet and start water flowing through the end of the other hose in the pool. Keep the ends under the water, when the siphon has begun you can remove the hose that's connected to the faucet.
If you have the time, energy & resources to change the water every day that's great, otherwise you can get away with doing it every 2-3 days without too much trouble.