Many aquarium pumps run on seals. You have to give these pumps a break during any 24 hour period so the seals don't wear out prematurely. This breaks your aquarium's 24 hour need for continuous pumping. It needs to be on an always on schedule so the proper water health levels, oxygen levels, and chemical profile of your aquarium are preserved. Also, running a pump 24/7 can eat into your electricity bills. Thankfully, the Danner Mag-Drive Supreme 18 from Pet Store takes care of all these concerns. It is extremely energy efficient and pumps continuously using less electricity. It is also magnetically driven so it uses no seals.
This means you can run it for 24 hours, 7 days a weak without having to give it a short rest to preserve seals. Finally, it doesn't suffer from any oil leak issues. This pump is also very versatile and can be used not only for your home aquarium, it is also a good water pump for piped statuary and ponds.