Summer Escapes Replacement Pool and Spa Filter for Type D,Fits P57100102 SFS-350 RP-350 RP-400 RP-600 RX-600 SFS-600 Model Specification: Size: 4.3x4.3x3.7inch How do I find a replacement filter for your pool or spa? If you already know the part number or replacement number of the filter element, you can search for the part number on our product page to quickly confirm that the filter is compatible. If you do not know the replacement part number of the cartridge, you can select the appropriate cartridge by measuring the existing cartridge. Use the following steps as a guide: 1. Measure the outer diameter of the cartridge in inches (+/-1/16). 2. Measure the cartridge length from end cap to end cap (+/-1/16). Exclude any handles or extensions. 3. Determine the correct top and bottom types. If the top and/or bottom is open, measure the inner diameter of the opening (+/-1/1/16 inches). If the end cap is closed, note its identifying features (i.e., "handle", "cone", etc.). 4. Make a note of the manufacturer and model of the filter on which the replacement element will be installed. 5. Make a note of whether there is a center core (there is a PVC pipe in the center). How to use:  1. Turn off the pump and water supply 2. Release the filter system valve 3. Remove the filter cover and pull out the old filter 4. Insert a new filter Package includes: 1 x Filter Note: 1. Manual measurement, the size will have an error of 0.5-2mm, please refer to the actual size​​. 2. Due to the difference in light and screen, the color of the product may be slightly different from the picture. Powerful filtration performance: The innovative anti-fouling technology makes the fabric more likely to absorb pollutants than ordinary fabrics. This filter effectively removes hair, leaves, dust, deposit, sand, etc. Enjoy a clean relaxing time in the pool and spa. Perfect Size: Length: 3.74 in, Diameter: 4.25 in, Inner Hole Diameter: 2.1 in, perfect for your filter, just like a glove. Unique: The unique three-leaf fiber structure and highly homogeneous media provide better filtration performance. The filter lasts longer than most replacement elements, is made of durable filter media, and is made of high-density polyester for less wasted filtration area. Type D Pool Filter: Compatible with Type VII and Type D filters: Comparable to Summer Waves, Summer Escapes and Intex Type D filters. Suitable for cartridge pumps: P57100102 SFS-350, RP-350, RP-400, RP-600, RX-600, SFS-600. Regular replacement: Pool filters are practical tools and must be replaced regularly to maintain filtration efficiency. It is recommended to change the filter every two weeks in summer to keep the water clean.