Actual flow rate under real plumbing resistance is the single detail that separates a crystal-clear swim from a summer of frustration. An 18-foot pool holds upwards of 7,000 gallons, yet factory-included systems rarely generate enough current to keep suspended debris moving toward the skimmer. The result is chronic cloudy water, sluggish circulation, and cheap paper cartridges that choke every two days. Owners end up spending hours hosing off pleated paper and wasting money on pool shock, only to watch dead zones turn dull again by Saturday afternoon.
Reclaiming clean water comes down to upgrading the circulation cycle so the equipment does the heavy lifting for you. Stepping up to a flow rate between 2,150 and 2,800 gallons per hour ensures every gallon gets filtered multiple times a day. Upgrading to a sand tank with a multi-port valve brings easy backwash maintenance, eliminating the messy cartridge swap entirely. Making sure the hoses match your wall ports (or using secure adapters) prevents air leaks and dripping connections. Below, see how the leading filter systems stack up to keep your swimming season effortless.
Now Available In A Convenient Tri-PackEasy To Clean Dacron Fiber MaterialFilter Cartridge Should Be Replaced Every Two WeeksNo Assembly Required
Key specs
- Pump compatibility
- Intex 28603EG
- Intex 28637EG
- Intex 28635EG
- Recommended replacement schedule
- Every 2 weeks
Pros:
- Direct fit for Intex filter pump models 28603EG, 28637EG, and 28635EG
- Dacron paper material allows quick hose-down cleaning between replacements
- Compatible with Intex HydroAeration fittings for enhanced pool circulation
- Compact dimensions at 8 inches high by 4.3 inches wide for standard housings
Cons:
- Requires replacement every two weeks to maintain adequate water flow
- Multi-pack of three will not cover a full summer season without reordering
- Cartridge only with no pump or housing included for pool circulation upgrades
SAND FILTER PUMP: The 14-inch Intex Krystal Clear sand filter pump with Hydro Aeration Technology improves circulation and filtration and improves water clarity; The pump runs on 110-120V and weighs 45.87 pounds.EASY-TO-USE: 6-function control makes maintenance easy, giving options to backwash, rins
Key specs
- Valve functions
- Filter
- Backwash and rinse
- Re-circulate
- Drain and close
- System flow rate
- 2,150 GPH in-pool
- Pool capacity limit
- Up to 17,200 gallons
Pros:
- Delivers a 2,150 GPH system flow rate to effectively turn over large 18-foot pools
- Six-function control valve enables filtering, backwashing, rinsing, and draining
- Built-in 24-hour timer features preset cycles from 2 to 12 hours for automated runtimes
- Media can last up to 5 years between complete sand changes
- Comes with two 1.5-inch connector hoses for immediate hookup
Cons:
- Heavy 40-pound dry weight requires a firm and level base near the pool
- Incompatible with 1.25-inch pool wall fittings without separate step-up adapters
- Partial assembly is required before filling the 14-inch tank with sand
【High Quality Filter Cartridge】 Keep your pool water crystal clear and give your swimming pool pump its best performance with the filter Cartridge Type A or C.【Compatible with type A or C filters】Size: 8X4.2 inch. Replaces Intex 29000E filter cartridge and fits any filter pump that uses Intex 59900
Key specs
- Fabric construction
- High-performance trilobal fabric is engineered with dirt-locking technology to hold fine contaminants while releasing dirt smoothly during hose washings.
- Cartridge dimensions
- 8 x 4.2 inches
Pros:
- Dirt-locking trilobal fabric captures fine sediment, sand, dust, and hair
- Broad fit across Intex pumps including 28603EG, 28637EG, 58603E, and 56638E
- Compatible with Krystal Klear 02 and 12R pump housings as an Intex 29000E replacement
- Trilobal pleats release captured debris quickly when rinsed with a garden hose
Cons:
- Two-pack provides only a four-week operational span under recommended two-week cycles
- Does not include replacement rubber seals or O-rings for the filter housing
6 efficient and high-performance replacement filter cartridges keep your pool water clean and crystal clearDesigned as a replacement filter cartridge for Type III and Type A/C swimming pool filtersCompatible with 1,000 and 1,500 gallon per hour filter pumps, ensuring a constant flow for optimum filt
Key specs
- Compatible pump capacities
- Engineered specifically for 1,000 GPH and 1,500 GPH filter pumps to maintain consistent flow across Power Round Frame above-ground pools.
Pros:
- Six-pack supply provides enough media for multiple two-week changeout cycles
- Compatible with both Type III and Type A or C filter pump configurations
- Designed for 1,000 and 1,500 gallon-per-hour filter pump housings
- Individually shrink-wrapped with insert cards for clean storage until needed
Cons:
- Unsuitable for higher-output 2,500 GPH pumps that require Type B cartridges
- Exact core opening and outer diameter measurements are not stated on the packaging
FILTER PUMP: The Intex Krystal Clear filter pump with Hydro Aeration Technology improves circulation and filtration, improves water clarity, and increased negative ions in the water. The pump runs on 110-120V and weighs 24.2 pounds.COMPATIBLE: The Intex pump is compatible with pools up to 15,200 gal
Key specs
- Plumbing connection size
- 1.25-inch (32 mm)
- Required cartridge type
- Type B (Item #29005E)
- Circulation ratings
- Operates at a 2,500 GPH pump rating with an actual in-pool system flow rate of 1,900 GPH to turn over larger above-ground volumes.
Pros:
- Robust 1,900 GPH system flow rate provides strong water turnover for pools up to 15,200 gallons
- Uses large Type B cartridges made with Dacron paper for enhanced particulate capture
- Integrates HydroAeration technology to increase water circulation and surface aeration
- Connects directly to pools equipped with standard 1.25-inch hose fittings
- Backed by a 2-year manufacturer warranty for pump reliability
Cons:
- Requires cartridge replacement every two weeks, raising ongoing seasonal operating effort
- Bulkier 19.56-pound housing requires more clearance than entry-level cartridge pumps
Pack of 4 Premium Quality Universal Replacement Filter Cartridges that are compatible with all above-ground pools and pumps that use type A or C filters, as well as type III filters. Filter cartridges replace Intex 59900E and 29000E filter cartridges.The filters are made with premium quality polyeth
Key specs
- Core construction
- Features a collapse-resistant hard plastic inner core that preserves structural integrity under steady pump suction pressure.
- Pump rating range
- 530 to 2,000 GPH
Pros:
- Polyethylene terephthalate fibers provide durable water filtration across repeated washings
- Molded with a collapse-resistant rigid plastic inner core to withstand pump suction
- Fits a wide range of pump flow rates between 530 GPH and 2,000 GPH
- Compatible across Intex, Bestway, and Summer Waves above-ground pool housings
Cons:
- Must be manually rinsed and swapped every two weeks for optimal clarity
- Not compatible with larger Intex 2,500 GPH systems requiring Type B cartridges
Intex 2500 GPH Swimming Pool Filter Pump With TimerYour above ground pool will be clean, clean, clean with the Intex 2500 GPH Filter Pump With TimerDesigned for Intex 24-foot and 18-foot Easy Set pools, Frame Set pools, Ellipse Oval pools, Rectangular Frame pools and similar sized swimming pools fro
Key specs
- Supported pool designs
- 18-foot and 24-foot Easy Set pools
- Metal Frame and Rectangular pools
- Ellipse Oval pools
- Integrated timer feature
- Built-in timer automates daily pump run times to maintain regular water turnover without manual daily switching.
Pros:
- High 1,900 GPH system flow rate engineered specifically for 18-foot and 24-foot pools
- Includes an integrated timer for automatic daily filtration cycles
- Ships with an initial Type B replacement filter cartridge ready for installation
- Sized to fit Intex Easy Set, Frame Set, Ellipse Oval, and Rectangular Frame pools
Cons:
- Ongoing chore of removing and cleaning Type B cartridges every two weeks
- Unit weight of 24.24 pounds requires dedicated level ground alongside the pool
💦【Easy Installation】- Portable 115V prefilter pool pump with Integrated 12in small-sized filter tank and 6-foot power cord can be easily moved and installed to your above ground pool/bathing tub by common 1.5”PVC tubing/discharge hoses for high flow.💦【Efficient Performace and Quiet Operation】- 0.3
Key specs
- Sand media capacity
- 42 lbs of sand
- Electrical cord length
- 6-foot power cord
- Motor horsepower
- 0.35 HP (115V)
Pros:
- Sand tank holds 42 pounds of media to provide high-capacity filtration for pools up to 7,500 gallons
- Four-way multi-port valve allows simple backwashing and system flushing
- Detachable strainer basket features a clear lid to inspect debris before reaching the impeller
- Reinforced thermoplastic housing resists corrosion in wet outdoor environments
- Uses standard 1.5-inch PVC tubing and discharge hoses for high-volume flow
Cons:
- Pool volume rating is capped at 7,500 gallons, which limits turnover margin on deeper 18-foot pools
- Silica sand is not included and must be purchased separately prior to startup
COMPATIBILITY: Pool Filter Type A or C Compatible with Intex Krystal Clear 530/1000/1500 GPH Pump, Flowclear 1000/1500 GPH Pump, Summer Waves SFX-1000, SFX-1500 Filter Pump, and more.EASY TO CLEAN: Uniformity and high-performance trilobal fabric make it easier to capture and release stains, so it’s
Key specs
- Physical measurements
- 8 in length, 4.25 in OD, 1-15/16 in ID
- Chemical maintenance note
- Manufacturer advises removing the cartridge from the filter chamber prior to cleaning with disinfectant to prevent premature fabric corrosion.
Pros:
- Bulk eight-pack covers sixteen weeks of continuous swimming when changed every two weeks
- Trilobal fabric traps fine dust, hair, sand, and leaves while simplifying washdowns
- Cross-compatible with Intex Krystal Clear, Bestway Flowclear, and Summer Waves SFX pumps
- Standard 8-inch height and 4.25-inch outer diameter fit common cartridge cylinders
Cons:
- Must be removed prior to using chlorine shock or chemical disinfectants to prevent degradation
- Inner core diameter of 1-15/16 inches must be verified against pump center posts
Sizable Capacity - This sand filter pump is housed in a one-piece 12-inch tank with a capacity of 42 pounds of sand that can filter above ground pools up to 10,000 gallons☀️Dependable Performance - This filter keeps the sand height level to expose water to the maximum sand surface level possible for
Key specs
- Regional sales restrictions
- Equipped with a capacitor start motor that is explicitly not certified for sale or use in California under state energy regulations.
- Tank media volume
- Holds 42 lbs of filter sand
Pros:
- Generous 3/4 HP pump paired with a 42-pound sand capacity tank handles pools up to 10,000 gallons
- Four-way multi-port valve simplifies backwash and rinse cycles to clear collected dirt
- Engineered for low-noise operation to minimize backyard equipment hum
- Tank geometry exposes circulating water to maximum sand surface area
Cons:
- Capacitor start motor design cannot be sold or shipped to addresses in California
- Filter sand media must be sourced and weighed separately before initial filling
- Requires verification of pool wall hose connections to ensure leak-free coupling
Compatible with pools with 1.25-inch diameter hose fittings; Pump capacity of 800 GPH for pools up to 18 feetEasy-to-clean, replaceable 290589 filter cartridge (not included)Comes with (2) 1.25-inch hoses for added convenienceJust hook up hoses and plug them into a 110-120V power outlet for easy ins
Key specs
- Safety certification
- cETLus listed
- Power cord length
- 25-foot cord with GFCI
- Included accessories
- Includes two 1.25-inch (32 mm) connection hoses to fit standard small above-ground pool wall outlets.
Pros:
- Compact and lightweight at 5.4 pounds for effortless seasonal positioning and storage
- Includes two 1.25-inch (32 mm) connection hoses for immediate pool wall hookup
- Long 25-foot power cord with GFCI plug provides flexible reaching distance to outdoor outlets
- Certified to cETLus electrical safety standards for outdoor swimming pool equipment
Cons:
- 800 GPH pump flow rate offers minimal circulation reserve for high-volume 18-foot pools
- Replacement 290589 filter cartridge is not included in the box and must be bought separately
Last update on 2026-10-08 / Affiliate links / Images, Product Titles, and Product Highlights from Amazon Product Advertising API
Is a sand filter or a cartridge filter better for an 18-foot pool?
It depends on your maintenance routine and preference for handling filter media. A sand setup with a 12-inch tank holding 42 pounds of sand operates with a multi-port valve, allowing you to backwash debris out of the system without disassembling the housing. A cartridge filter pump, such as a 2,500 GPH unit rated for up to 15,200 gallons, provides direct mechanical filtration using pleated Dacron or polyethylene terephthalate media. Cartridge systems require manual rinsing and periodic replacements, while sand setups keep the sand bed intact inside the tank and rely on valve reversals to clear trapped dirt.
What flow rate keeps an 18-foot pool clear?
Pumps delivering between 800 GPH and 2,800 GPH are sized to manage pools up to 18 feet. An 800 GPH pump is rated for pools up to 18 feet when paired with 32 mm hoses, but larger capacities circulate water faster. A 2,500 GPH cartridge pump is rated for pools up to 15,200 gallons, while a 2,800 GPH sand system provides high turnover for above-ground setups. Choosing an upgraded swimming pool filter system with a higher flow rate prevents stagnant zones and moves water efficiently across the entire surface.
Do you need 1.25-inch or 1.5-inch hose fittings for an 18-foot pool?
Check the exterior diameter of your pool wall connection before selecting a pump. Certain setups, such as an 800 GPH pump, connect directly to pools with 1.25-inch diameter hose fittings using 32 mm hoses. Larger systems rated at 2,500 GPH or 2,800 GPH often feature larger fittings and threaded collars. If your pool has standard 1.25-inch wall ports and you upgrade to a high-capacity pump, verify whether adapter fittings are required to secure a leak-free attachment.
What multi-port valve settings should you look for on a sand filter?
Look for multi-port valves that include backwash and rinse functions to simplify weekly maintenance. A 4-way valve on a 12-inch tank provides standard path routing, while a 6-function valve includes settings to filter, backwash, rinse, re-circulate, drain, and close the system. Running the backwash setting reverses water flow to dislodge sediment from the 42-pound sand bed, while the rinse setting settles the media before returning clean water to the pool.
How do you verify replacement cartridge compatibility?
Confirm the required cartridge letter and physical dimensions listed on your pump. Pumps rated between 1,000 GPH and 1,500 GPH commonly use Type A or C cartridges, which measure roughly 8 inches in height and 4.2 to 4.3 inches across, and also fit systems accepting Type III filters. Larger models such as a 2,500 GPH pump require a Type B replacement cartridge, while compact units can use specialized numbers like 290589. Check the manufacturer model code on your pump housing to ensure the pleated cartridge seats firmly without bypassing water.
How do built-in timers assist with water filtration cycles?
Integrated timers automate daily run times so you do not have to cycle the pump on and off manually. Certain 14-inch sand filter models feature a built-in 24-hour timer offering preset cycles from 2 to 12 hours. Dedicated 2,500 GPH cartridge filter pumps also come equipped with built-in timers. Setting regular daily run cycles maintains consistent turnover, preventing the water stagnation that leads to cloudiness.
