Check the listing for details. DEEP BLUE PRO FILTER PADS AMMONIA & NITRATE REDUCER CARBON & POLYFIBER ( 4 ). Condition: New. Listed at 34.19 USD. Listing is for ( 4 ) : DEEP BLUE PROFESSIONL "CUT TO FIT" FILTER PADS The following set of 4 filter pads will be shipped: ( 1 ) 18" x 10" CARBON PAD ( 1 ) 18" x 10" AMMONIA REDUCER PAD ( 1 ) 18" x 10" NITRATE REDUCER PAD ( 1 ) 18" x 30" ADVANCED POLYFIBER PAD AVANTAGES 18 x 10 inch pads - Cut to fit media pads traps micro and macro organic particles, foreign debris, and excess fish food. For use in custom sumps/refugiums, hang-on filters, prefilter boxes, and more. Safe for both freshwater and marine aquaria ! Chemical & Mechanical Dual stage filtration rapidly reduces phosphate levels ! Promotes a healthy aquatic environment !New thicker, more rigid design for extended use ! Set of 4 filter pads. 18" x 10" CARBON PAD:Chemical & Mechanical Dual stage filtrationAbsorbs odors, discoloration, and toxins1/2" Thick18" x 10" AMMONIA REDUCER PAD: Chemical & Mechanical Dual stage filtrationRapidly reduces ammonia levels1/2" Thick 18" x 10" NITRATE REDUCER PAD: Chemical & Mechanical Dual stage filtrationRapidly reduces nitrate levels1/2" Thick18" x 30" ADVANCED POLYFIBER PAD:3X more pad than other leading brands Thin Poly Fiber approx 1/4" thick Dense and rigid design for extended use. Safely suspends and removes micro & macro organic particles, foreign debris, excess fish food and aquatic waste. Promotes beneficial bacteria colonization for a healthy aquatic environment. For freshwater & marine aquariums. Use Cut-To-Fit for:Filter cartridge framesHanging filterTrickle filterWet/dry filter drip trayPowerhead attachmentCanister filterPond filter Please feel free to contact me for combined auction shipping rates or with any questions or concerns that you may have about my products. Thank you ! <div><a href="HTTPS://mostpopular.sellathon.com/?id=AC477244"><img src="HTTPS://www.sellathon.com/Resources/Images/countercredit.gif" border="0"></a></div>