# Sandfilteranlage: how long to run?

- Possible applications for sand filter systems
- How long to run a sand filter in the aquarium?
- How long to run a sand filter system for a pool?
- Tips & Tricks

In various applications, sand filters are used to mechanically clean the water. When using a sand filter system for a swimming pool arises the question of how long you should let this run. Therefore, we have summarized below important tips and clues to know exactly how long the sand **filter** system should run.

### Possible applications for sand filter systems

Sand filters are extremely efficient water filters for various applications. The water is mechanically cleaned. Sand filter systems are therefore suitable for the following applications, among others:

- Sand filter systems for the swimming pool
- Sand filter for aquariums
- Sand filter for the treatment plant (public and private)
- Sand filter for air turbines (aviation)
- Sand filter for self-sufficient facilities (shelters, bunkers)
- Sand filter for wells (water pumps and domestic waterworks)

#### Water filtration, where the runtime is important

For some of the plants, water is filtered once before further use. This includes the filtering of well water or the filtration of sewage treatment plants. In other facilities, in turn, the same water should be constantly cleaned. These include aquariums and swimming pools. Therefore, here is the question of how **long** you should run a sand filter system.

### How long to run a sand filter in the aquarium?

The question is not so easy to answer with the aquarium. For most aquariums you should and should run the sand filter system around the clock or at least 12 hours a day. It depends on many factors, for example, whether to filter in the secondary or main current. In addition, however, the size of the sand filter system for the aquarium is crucial.

Restrictions may exist especially in saltwater tanks. Some marine animals that live in saltwater tanks feed on plankton. But plankton is also filtered out of the pool water. In addition, salt is also filtered out. Basically, the aquarium water should be filtered three to four times for efficient cleaning.

### How long to run a sand filter system for a pool?

The daily duration of the sand filter system for a swimming pool can be more specific information. Here you can first follow some rules of thumb:

- All the water should have been filtered within four hours
- The water in the pool should have been filtered two to three times a day

The two-time water filtration should be sufficient for most pools. Considering now that the entire pool water should be filtered within four hours, a properly sized filter must therefore already be taken into account when designing and planning the sand filter system.

#### Calculation of filter throughput per hour

In terms of the fact that all the water should be filtered within four hours, so the total amount of water must be divided by 4. That would be the following calculation:

- Length multiplied by width multiplied by depth divided by 4 is equal to throughput per hour

For a pool 4 m long, 3 m wide and 2 m deep, this would be:

- 4 * 3 * 2 = 24 m3; 24/4 = 6 m3 = 6,000 l / h

#### Frequency of filtration of all water

Accordingly, the flow rate would have to be 6,000 liters per hour. Then the system should also be in operation for eight hours a day. Then it is ensured that the water in the swimming pool the required is cleaned twice.

### Tips & Tricks

If the sand filter system had a higher flow volume, this would naturally reduce the throughput time. Keep in mind, however, that certain flow rates should not be exceeded. In order to get a good clue here again, the amount of sand should be adjusted to the amount of water.The amount of sand should be at least equal to the water volume of the pool, but better still twice the volume of the pool (starting from cubic meters). Accordingly, 24 m3 of water would require at least 24 kg, better still 48 kg of quartz sand. Other important factors are the filling height and the layer structure of the sand. For more information, see "Structure and materials of sand filter systems".