Undergravel Filter Box

The Asian style Undergravel Filter Box is a unique way to filter your shrimp tank or aquarium. It works by pulling water slowly through the media to the bottom of the box and pushing it out the tube at the top.  This allows for a large amount of media to be used, and due to the water slowly passing through it ensure that the media or soil always stays oxygenated and that no dead spots occur.

Due to the lower resistance of the filter, it allows for a much higher flow rate when compared to a normal sponge filter. These filters have been tested to filter an average of 120 Liters per hour and they can hold 1.5L of filter media (1.9L total volume). If given enough pressure and air, the filter can reach almost double the flow rate.

We would recommend a single Undergravel Filter Box per 2ft tank. (Or smaller).

A great advantage of the filter is that it requires minimal maintenance over its life span. Its recommended to only clean the filter when you restart your tank, or if your soil buffering capability has run out (Normally 1-2 years).  Replacing them is as simple as removing the box from the tank, removing the content, giving it a rinse and then filling it back up. If you have a backup filter that has been pre-cycled you can instantly replace it in your tank to keep on running.

The Undergravel Filter Box is just a box thus you are free to experiment and optimize it as you see fit. You can add any media or soil to it in any quantities. If you are only looking to buffer your water and are not worried about biological filtration, you can fill the entire box with buffering substrate. This will still provide biological filtration, as a large amount of bacteria lives on your substrate.

Below are some other options for running the filter

• 50% Biological Media and 50% Crushed Lavarock
• 25% Biological Media and 75% Buffering substrate (Our preferred setup)
• 100% Crushed Lavarock
• 100% Biological media
• 20% Sponge, 20% media, 60% Biological Media

This filter kit includes:

• Filter box (14cm x 14cm x 12cm).
• 1-meter airline tubing.
• 1 airstone.
• Filter plate
• Higher adjustable tubing (Maximum height 38cm)
• 250ml high-grade biological filter media.

Kindly note that this kit does not include buffering soil or lavarock.

This is a 100% locally produced product! Due to it being handmade please expect some minor differences in the finish of it.

Looking for crushed lavarock for the filter? Get it here