We will custom cut any of our foam sizes to meet your needs. You can make a full-tank filter, also known as a Hamburg Matten Filter in some circles. Whether you want a foam filter/tank divider, pre-filter for a sump, a piece to fit your own homemade filter or a replacement foam for another manufacturer's filter, we'll cut it for you as long as it's a rectangular piece. Our water-proof reticulated foam has much greater surface area than the Matala™ style filter sheets. There is no better filter material for nitrifying bacteria made anywhere! By the way, our cost per quart is $2.73, or 3.8 cents cu/in., and even less for large quantities. Our foam is Made in the USA. We've using this exact foam in our own tanks for 30 years! In fact, some of those original filters are still in use!
How to order: You have to select one of the stock sizes in the drop-down menu below. That same exact thickness of the stock size has to be entered into the "thickness" box of the calculator. If you want a thickness that is less than a stock size, you must enter a quantity that divides evenly into a stock size. For example - If you want to order 1.5" thick pieces, you must order in quantities of 2, since we get two 1.5" thick pieces out of a stock 3" thick foam piece. In the calculator below, the Maximum "Short-Side" we can cut on a non-stock size
Here's another example: If you want a piece that is 2.25" thick, then you must enter 3" in the calculator, since we do not have a stock size that 2.25" divides into evenly. Then, send a separate email asking us to cut it down to 2.25" (if the short side is less than 12").
Maximum Long-Side is 48""
Maximum Short-Side is 29"
Keep in mind that it doesn't matter what we call the dimensions. The maximum long side is 48" and the maximum short side is 29". You can position the long side any way you want in your aquarium.
The shopping cart sometimes has a difficult time getting the shipping cost correct on these custom pieces. The carriers charge dimensional weights on some large, light packages and it can greatly affect the price. If the shipping is not correctly figured by the cart, we will let you know before cutting your foam, so you have the opportunity to cancel if you want. We will also refund a portion if the cart has figured the cost too high.
Note: Large pieces may have to be folded or rolled into a smaller package. This is done to save on shipping charges (sometimes the savings is significant). If you want your piece to remain flat during shipping, let us know and we will inform you of the additional shipping charges that you will have to pay. When receiving folded pieces, just place them on a flat surface with a bit of weight on them and within a day or two they will regain their original flat shape.
Important Ordering Tips: When measuring tank width, it is usually better to have it wider than needed. If the piece is too narrow, the gap will allow water to pass through unfiltered on the side. A piece that is slightly too large, will compress to fit the space and will work exactly the same. It also stays in place better. We recommend adding at least ¼" to the length or width for every 12" of foam, to make sure the foam fits tightly between two walls. We are unable to be perfect on foam cuts. We will be accurate to within ± 1/8" on all cuts. If you need to cut a bit off a piece, a very sharp knife works well. Some find that an electric knife works the best.
Many of these Hamburg Mattenfilter style filters have such a large surface area that they out-filter much more elaborate and expensive filters on the market. Maintenance is simple and there is almost nothing to ever break or wear out.
PPI - stands for pores per inch. So, 50 ppi means 50 pores per inch, which means they are smaller pores than 15 ppi, which is only 15 pores per inch.
Smaller pores tend to clog quicker, but offer more surface area. Literally all pores sizes will over-filter a heavily stocked aquarium. The biggest considerations are usually how quickly it will clog or are there any new-born fry that may swim into a large pore size.
General Miminum Thickness Guideline for Dividers that will stand on their own:
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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