Angels Plus Cube Sponge Filter and
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Innovation: We were the first company to offer the weighted cube filter back in 1987. We were first to use reticulated foam for our sponge filters (now the industry standard) and we have now developed the Mag Filter - which is another step forward in sponge filter technology. We offered the best in 1987 and we're still making the finest reticulated foam filters today. We use the highest grade reticulated foam available anywhere. There is none better.
All parts to our filters are Made in the USA
 Slate-bottom |
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 Mag Filter Close-Up |
 PPI Sizes |
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PPI stands for the number of pores per linear inch. 15 PPI is our largest pore filter. It works great in tanks that have a lot of fish waste. 20/30 PPI is great for all-around use and 50 PPI is designed for small fry. The pore size is small enough that you will not risk a new-born swimming into a pore and getting stuck. The bio-sponge is a non-reticulated foam that has tremendous surface area, but flow-through is not as good as the reticulated sponges, so it is better for small fish and tanks with very little waste.
3" cube-filter has 27 cubic in.
of volume
4" cube-filter has
64 cubic in. of volume
5" cube-filter has 125 cubic in.
of volume
Enter quantity desired in each box below
Active Filters
These are fully cycled complete filters and are biologically active. They are taken from our disease-free tanks and contain a large, healthy colony of nitrifying bacteria and other beneficial micro organisms. A healthy tank contains a lot more than just some nitrifying bacteria and our active filters have the other essential mico-organisms. These filters provide an instant-cycle for any aquarium you put them in. You can safely add fish to the tank immediately after placing one of these in the tank. Read about a test done on them by a hobbyist here. We put them in our fully-cycled tanks for 4-6 weeks prior to selling them, with the sole purpose of providing them to customers. This is a far superior way of "starting" a new tank, when compared to other bacteria starters. We are certain that our active filters work many times faster and better than the next best cycling product on the market. Our tanks do contain red ramshorn snails and they are a possible passenger on these filters. Don't order these if you don't want the possibility of small snails hitching a ride on them. All filters come complete. You need to supply the airline and the air to run them..Our Active Filters are irregular sizes. Most are rectangular, not cubes.
 15-30 PPI Foam Media could be black, blue or natural color |
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 (clear lift tube for demonstration purposes) |
 Lift Tubes 9.5" & 6" |
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Assembly Instructions for MAG Sponge Filters, Click here
For Custom Sizes and larger Foam Filters, Click here
Angels Plus Sponge Filters are the most efficient filters on the market. They are carefully designed for optimum flow rate and the ability to grow dense nitrifying bacteria colonies. Keep in mind that flow rate can be too fast for a sponge filter and a faster flow does not necessarily mean a better filter. All foam material is not created equal. Some contain biocides (poisons). Many have fire retardants on them. Others are simply made from a material that does not promote nitrifying bacteria growth. They may not kill your fish, but the beneficial bacteria, will not grow properly. Our foam is chosen for its suitability as a medium for nitrifying bacteria. We have tested dozens of materials before choosing these. We've used them in our own hatcheries for almost 30 years. They have proven to be the best for raising our valuable fish. We have sold over 125,000 of them since 1989 when we first started offering them to the public.
Weighted vs MAG Sponge Filters:
Our standard filters come with a slate base. Real slate is expensive, but it is very dense and heavy, along with being fish-safe. This weight keeps them on the tank bottom but allows you to easily slide them around. This makes real slate ideal for weighted filters. Our MAG Filters are designed to attach to a tank side wall through the use of powerful magnets. Although you can easily slide them, they cannot be put into the middle of the tank floor without a modification to the lift tube. The MAG Filters rinse more easily since the base does not get in the way. They are also cheaper to ship. Some will prefer one design over the other, but it has little to do with filter efficiency, which is virtually identical between the two.
Beware of filters using tile as a base. Tile is usually covered by a glaze which usually contains heavy metals. When this glaze dissolves in your water (which it surely will over time), it can be toxic to your fish. Our filters also have an interior chamber that improves flow and function, which is missing on most other sponge filters. It's critical for optimum performance. We use a durable lift tube that does not get brittle over time. The sponge filters come standard with a 6" lift tube. Perforated lift tubes do not work nearly as well. The perforations can clog and they do not draw equally from all pores in the sponge - creating dead spots.
Our reticulated filters are designed to decrease clogging and make cleaning easier. They are made from a waterproof reticulated polyether foam with an open-pore design. This is the same material as the Poret™ brand of foam. When compared to a typical polyurethane foam, our reticulated foams have much greater flow-through, are more durable, have a greater capacity for holding waste, and are not as easily collapsible. There are several grades on the market and we carry the highest grade available that is usable for filtration. It should come as no surprise that many companies choose the cheapest grade available. In our hatcheries, we are still using some of our original reticulated filters that are over 20 years old and they are still performing like new. You cannot buy a better filter foam product anywhere, at any price.
Our Bio-Sponge Filter is polyurethane non-reticulated foam that has tremendous surface area. It is most often used on tanks that have very small fry in them. This filter is not best for tanks with a lot of fish waste because it clogs relatively easily. Typically any fry older than a week will be fine with our 30 PPI Filters.
15-30 PPI Foam Bio-Media: This product is the excess media from our filter manufacturing process. We sell it below cost, which is a great deal for those who can use it. It's ideal for placing in canister filters, outside power filter boxes, box filters, and bio towers. It is very porous with tons of surface area, creating an idea media for culturing beneficial nitrifying bacteria. Each package contains a minimum of 230 cubic inches of Foam Bio-Media (this amount fills a 1 gallon jar).
To learn more about aquarium filtration click here!
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