Internal filters in the aquarium

internal filters

Aquarium internal filters: advantages and disadvantages as well as handling

If you have decide to use an internal filter for your aquarium, then you should read below to find out what the advantages and disadvantages of internal filters are.

Advantages and disadvantages of internal filters in the aquarium

Advantages of internal filters

  • Consume less electricity than external filters with the same output.
  • Cleaning is easier than with external filters because no hoses clog.
  • Leaks do not lead to flooding.
  • Mat filters do not have to be switched off when feeding live food.
  • Mat filters do not kill fry.

Disadvantages of internal filters

  • Are visible in the aquarium.
  • Take up space in the aquarium.
  • If the substrate needs cleaning, there is always a splash of water at the aquarium.
  • Filter sludge usually gets into the aquarium during cleaning.
  • Reaching into the aquarium creates unrest among the fish.
  • Always have narrow cracks, crevices and holes in which small fish can get caught.
  • Pump housings or cables can touch the aquarium and cause humming noises.

How do I throttle the internal filter in the aquarium?

Internal filters, the performance of which cannot be adjusted, can be throttled in various ways.

Decrease the amount of water

  • Often the flow is only large when the filter is clean. Over time, the filter clogs and the flow automatically decreases.
  • Put a hose on the air outlet and regulate the hose with a hose clamp, a stopcock or something similar.
  • Put a cork, a lid or something similar in or on the air outlet pipe and drill a hole in it that creates the desired flow. The hole creates counter pressure on the pump so that less moving water comes out of the filter. The nozzle effect through the hole does not increase the outlet speed so high that the effect predominates and the flow increases.
  • Shorten the pump blades. Most wings can be shortened up to halfway. This reduces the pressure and the flow rate. In addition, the outlet cross-section can be reduced using a clamping screw or the like. Pumps modified in this way are more prone to clogging due to filter sludge or other particles. They need more frequent observation, maintenance, and cleaning. The wings must be shortened very evenly so that there is no imbalance.
  • Use a hose to return part of the water flowing out into the filter. Connect three hoses with a T-piece. Push one end of the hose onto the filter outlet. Return the water to the aquarium or the filter via the other two hoses. Regulate the respective amount of water with shut-off taps or clamps. Measure the hose lengths as required.

The resistance to the outflow is greatly increased by the regulation. The pumps must therefore always be controlled on the pressure side. In the case of non-positive pumps, e.g. Impeller pumps, then no damage can occur. There is always slipping on the impeller, which limits the pressure on the impeller.

A disadvantage of these methods is that less water runs through the filter, which means that the filter performance may be reduced. If the outlet is reduced too much, loud noises can occur with at least some pumps.

internal filters
Internal filters for your aquarium

Lower the outflow speed while maintaining the same amount of water

  • Saw off a 0.5 liter PET bottle so that a thick funnel is created. Soften the edges by heating. Attach the funnel with a hose to the filter outlet. The current is then no longer as fast without making any noise. The funnel is transparent and therefore does not disturb.
  • A piece of pantyhose is pulled over the attached part of the nozzle at the filter outlet and tucked in at the end near the filter. The socket is put back on together with the fabric. This holds up well and the filter is throttled because the water has to flow through the fabric.
  • Route the filter outlet with a piece of hose against the rear window or in a corner. If a foam cube is placed there, the flow will spread further.
  • Put a pipe on the filter outlet and make several large holes in the pipe. The outflow area becomes larger and the water is more distributed in the aquarium.
  • Place a piece of course, blue filter sponge on the filter outlet. Secure with cable ties so that the sponge does not drift away. Similar devices are commercially available as covers for suction baskets. They are usually round and have a hole for the pipe. The sharp water flow is broken so far that there is almost no flow in the aquarium.
The difference between External Filters and Internal Filters for your aquarium

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