Dedicated Design: our phosphate remover pads are specially designed to conveniently compatible with 307/407 and 306/406 canister filter models; Their proper size compatibility ensures ideal filtration performance to remove and control phosphates, contributing to healthier aquatic systems Sufficient Quantity, Extended Use: our products extended use and replacement; The sufficient quantity ensures that you 't run out of these indispensable pads for your aquarium anytime soon Effective Phosphate Remover: with the ability to control phosphates by seizing small particles effectively, our aquarium nitrate remover pads play a vital role in ensuring a clean and healthy habitat for the aquatic creatures; This feature makes them an indispensable tool for every aquarium lover Proper Size: our filter pad for fish tank measures about 3.3 x 4.4 x 7.3 inches/ 8.38 x 11.18 x 18.54 cm, providing ideal filtration performance and efficient water flow, reducing congestion, achieving lasting filtration, and bringing you a good user experience, versatile for a variety of aquarium setups Quality Material: constructed using material, our aquarium phosphate remover pads are designed to withstand long term use in both fresh water and saltwater environments; It is recommended that you change your filter pad every 2-8 weeks and change your filter frequently to maintain a better water environment in your aquarium, ensuring a cleaner aquatic habitat for your fishes and marine life Color: Green Material: plastic Package Contents: 20 * Phosphate Remover Pads Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.