Features: These spongiform filter mattresses effectively seize dirt, debris, and sediments in pond water, improving water integrity and creating a better environment for fish and bushes. Developed to stop large particles and debris from entering supporter, reducing the need for frequent maintenance and extending the existence of your pond sieving fan. The spongiform filter mattresses secure optimal stream by stopping fan blockages and maintaining neat, clear liquid in your pond otherwise spring. Produced from excellent, oxidation immune polyurethane spume, these sieves is constructed to endure extended outdoor use and continuous exposure to water. Precisely developed to fit various 660 spring compressors,making they ideal replacements for constructed in pond sieving arrangements. Specifications: 1) Impurities in screened waterebog: Cotton filter mattresses seize soil and debris in pond water 2) Protect fan equipment: stop large particles of impurities from entering supporter body and extend the service life of supporter 3) [Water quality clagency: Small electronics sanitation and integrity of pool water Color:Blue Size:30.5x22.5cm Quailty:1pc Package Includes: 3 sponge filter note: Note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item.