Description
Poly Filter Pad 4″x 8″ — Colour-changing chemical filtration pad for canister, hang-on and power filters
A tank that has just finished a course of medication, or one where ammonia has spiked after a fish loss, needs chemical filtration that works quickly and shows what it is catching. Poly Filter Pad 4″x 8″ (SKU: 100499) is the Poly-Filter from Poly-Bio-Marine Inc. of Reading, Pennsylvania, a chemical filtration pad for fresh and salt water aquariums, here in the 4 × 8 inch (about 10 × 20 cm) size that slips into a canister basket or the media chamber of a hang-on filter and can be trimmed with scissors. Poly-Bio-Marine states that it adsorbs excess ammonia during a spike while staying non-toxic and harmless to biological filtration, and that it removes heavy metals, harmful organics, phosphate and medications once they have done their job, without removing desirable trace elements.
The pad also reports what it has absorbed. Poly-Bio-Marine’s colour chart reads blue with copper salts, light green to aqua with free copper, orange with iron, red with aluminium, yellowish green with ammonia, and white through beige and brown to black as organics build up. Place it where all the water passes through it after mechanical filtration, with no bypass: in the chemical compartment of a canister, or on the bottom plate of a power filter under a layer of floss, without restricting flow. Take it out before dosing medication, vitamins or trace elements, then return it 12 hours after supplements, or once treatment ends to clear residual medication. Heavy slime-producing water conditioners can coat the pad and reduce absorption. Replace it once it has changed colour and is exhausted.
Usage & Application
When to Use
- After medication: Clears residual copper, formalin, malachite green and antibiotics once treatment ends.
- Ammonia spikes: Holds ammonia down while the biofilter catches up after a loss or overload.
- Metals and organics: Copper, iron and aluminium contamination, plus dissolved organic waste.
- Small and medium filters: A pad sized for canister baskets, hang-on filters and power filters.
Placement & Usage Guide
- After mechanical media: Water should reach the pad after floss or sponge has taken out the larger debris.
- No bypass: Fit it so water cannot slip around the edges; trim with scissors if needed.
- Out for dosing: Remove before medicating or adding trace elements; return after 12 hours for supplements.
- Read the colour: Use the colour change to see what is being removed and when the pad is spent.
Product Specifications & Highlights
Key Features
- Colour indicator: Changes colour to show copper, iron, aluminium, ammonia or organics.
- Biofilter-safe: Non-toxic and harmless to biological filtration, per Poly-Bio-Marine.
- Keeps trace elements: Removes contaminants without stripping desirable trace elements.
- Medication removal: Clears treatments after they have done their job.
- 4 × 8 inch pad: Sized for everyday filters and easy to cut down.
Product Details
- Brand: Poly-Bio-Marine Inc (USA)
- SKU: 100499
- Barcode (GTIN/UPC): 718286040800
- Product Type: Filter Media > Chemical Filtration Pad
- Pad Size: About 10 × 20 cm (4 × 8 in)
- Removes: Excess ammonia, heavy metals, phosphate, harmful organics, medications
- Not Removed: Desirable trace elements; calcium, magnesium, strontium and alkalinity supplements (retailer statement)
- Colour Chart: Blue (copper salt), aqua (free copper), orange (iron), red (aluminium), yellowish green (ammonia), beige to black (organics)
- Other Sizes: 12 × 12 in pad (SKU 100500)
- Target Environment: Freshwater and marine aquariums

















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