30 ppi Cube Sponge Filters

30 ppi Cube Sponge Filter Sponge Filter Lift Tubes

Slate Bottom Cube Filter
Our new size - 4.25" cube has 20% more volume than a 4" cube.

Slate Bottom Cube Filter 3.5 inch Sponge Filter Slate Base

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 4.25" 30ppi Slate Bottom Filter  $5.95
 5" 30ppi Slate Bottom Filter  $10.75

 Replacement 4.25" 30ppi Sponge   $3.25
 Replacement 5" 30ppi Sponge   $5.95
 Replacement 3.5" Slate Bottom   $2.75
 Extra 6" Blue Lift Tube   $0.45
 Extra 9.5" Blue Lift Tube   $0.75


Complete filter includes slate bottom, "Pro" Reticulated Sponge and 6" lift tube.  You need to supply the airline and air supply.

The slate bottom filters are heavy and stay solidly on the bottom. They are easy to slide out of the way when catching fish. Unlike some tiles, slate is completely safe and natural for the fish.  Our sponge is made from the finest reticulated waterproof filter foam in the world. It is extremely durable and completely fish safe.  All filter parts are made here in the USA.


Mag Cube Filter

30 ppi Mag Sponge Filter 30 ppi Mag Sponge Filter Sponge Filter Replacement Magnet Pair

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 4" 30ppi MAG   $5.95
 5" 30ppi MAG   $11.75
 Replacement Magnets (pair)   $2.20
 Extra 6" Blue Lift Tube   $0.45
 Extra 9.5" Blue Lift Tube   $0.75


Complete filter includes "Pro" Reticulated Sponge, magnets and 6" lift tube.  You need to supply the airline and air supply.

The MAG filters use powerful epoxy-coated magnets to attach to the aquarium. One on the filter and one that you place on the outside of the tank.  Some prefer these because you can put these anywhere you want and have them stay in place.  Place a dab of silicone or tape on the outside-magnet to keep it in place when you remove the filter. These filter are also super easy to clean.

We may compress these during shipping to avoid "Oversize" charges.  Let them sit out for a day after receiving them and they will regain their original shape.


Internal-Weight Cube Filter

3,4 and 5 inch Internal-Weight Sponge Filters 5 inch 30ppi Internal-Weight Sponge Filters

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 4.25" 30ppi Internal-Weight   $5.75
 5" 30ppi Internal-Weight   $10.75
 Extra 6" Blue ift Tube   $0.45
 Extra 9.5" Blue Lift Tube   $0.75


Complete filter includes "Pro" Reticulated Sponge, internal weight and 6" lift tube.  You need to supply the airline and air supply.

The Internal-Weight Cube Sponge filters use glass balls to weight them down. They are not as heavy as the slate-bottom filters, but much easier to clean and the glass balls will never fall out. Some like to use these suspended in mid tank.  They work very well like this.

We may compress these during shipping to avoid "Oversize" charges.  Let them sit out for a day after receiving them and they will regain their original shape.

If the filter floats to the surface shortly after putting it into your tank, that means that air is trapped in the foam. Squeeze it thoroughly while holding it under water to remove the air. It helps to remove the lift tube while doing this. The foam is more dense than water and always sinks if there is no air trapped.


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  • Description
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  • 3" cube filter has a volume of 27 cubic inches
  • 4" cube filter has a volume of 64 cubic inches
  • 5" cube filter has a volume of 125 cubic inches

PPI stands for the number of pores per linear inch. 30 PPI is our middle pore-size filter. It works great as an all-around choice and does a very good job in most situations.

Lift Tube

Assembly: Insert airline into the small hole drilled in the side of the top of the lift tube. Then push it to with 1/2" of the bottom. Then, insert bottom of lift into the small hole in the Sponge. Push the lift tube in about 1". It should be a tight fit.

Image is using a clear lift tube for demonstration purposes.

Shipping Quotes

The shopping cart will enable you to get a shipping quote before paying for an order. Simply add the items to the cart, view the cart by clicking on the "view cart" link in the upper left corner and it will enable you to get a total for the shipping before committing to an item.

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Comments
 
I love these 30ppi filters. The foam pores seems to be the perfect size for keeping my water crystal clear.
Dale Wolanski, Wed Sep 10, 2014
 
You can buy more expensive sponge filters, but you can't buy any that work better than these - luv em.
Sandy Wesley, Sun Feb 23, 2014