Intex SF40110 - User Manual

Questions and Answers

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Rebecca MasonAug 17, 2025
What to do if Intex SF40110 doesn’t pump water or flow is very slow?
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  David JonesAug 17, 2025
  If your Intex Water Pump isn’t pumping water or the flow is slow, try the following: * Release any trapped air (refer to the operating instructions section). * Clear obstructions in the intake hose. * Tighten hose clamps and inspect hoses for damage; also, check the pool water level. * Backwash the filter if the pool is excessively dirty. * Remove about 1” of sand if the sand media is clogged with dirt or has crusting/caking. * Ensure the nozzle is at the upper position of the pool inlet and the strainer at the lower position of the pool outlet. * Remove any pool vacuuming device attached to the system line. * Confirm the inlet threaded air connector is connected to the pool inlet upper hole.
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Brandi SandersAug 20, 2025
What to do if my Intex SF40110 doesn't work?
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  arroyochloeAug 20, 2025
  If your Intex Water Pump isn't working, first ensure the pool water level is correct. Then, clean the strainer screens at the pool inlet. Check for air leaks on the intake hose and tighten hose clamps or inspect the hose for damage. If the issue persists, it could be a faulty motor or a jammed impeller.
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brenda03Aug 22, 2025
What to do if the Intex SF40110 filter motor fails to start?
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  Charles ReevesAug 23, 2025
  First, ensure the line cord is plugged into a 3-wire outlet protected by a Class A Ground Fault Circuit Interrupter, or RCD. If the GFCI/RCD circuit breaker is tripped, reset it. If it trips repeatedly, turn off the breaker and consult an electrician. Also, the motor may be too hot; allow it to cool down before restarting.
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gallagherkristinaAug 26, 2025
What to do if Intex SF40110 filter doesn’t clean pool?
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  Audrey SandersAug 26, 2025
  If the Intex Water Pump filter isn’t cleaning the pool, adjust the chlorine and pH levels, consulting local swimming pool supply stores if needed. Ensure the tank is loaded with filter sand according to the “sand loading instructions”. Set the 4-way valve to the “FILTER” position. If the pool is excessively dirty, operate the filter for longer periods. Also, clean the strainer screen at the inlet if it restricts water flow.
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pearsonaliciaAug 28, 2025
Why is my Intex SF40110 Water Pump leaking from the hose?
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  Tyler BaldwinAug 28, 2025
  Hose leaks in your Intex Water Pump are typically due to poorly fitted hose clamps (tighten or reinstall them), a dislodged hose o-ring (put it back into the groove), or a broken hose (replace it).
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Terri DixonAug 30, 2025
What to do if the Intex Water Pump timer is inaccurate or can't be set?
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  James PerezAug 30, 2025
  If the timer on your Intex Water Pump is inaccurate or can't be set, turn off the pump and restart it 5 minutes later. If that doesn't work, try re-setting the timer.
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millercoreySep 2, 2025
What to do if Intex SF40110 Water Pump 4-way valve or cover leaking?
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  Steve BerrySep 2, 2025
  If the 4-way valve or cover on your Intex Water Pump is leaking, remove the 4-way valve cover and make sure the sand tank o-ring is in place and clean. If dirty, clean it with garden hose water. Also, ensure the flange clamp is securely tightened.
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bgonzalesSep 5, 2025
What to do if sand is flowing back into the pool from my Intex SF40110 Water Pump?
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  kristinedelgadoSep 5, 2025
  If sand is flowing back into the pool, ensure you are using only No. 20 silica sand with a particle size range of 0.45 to 0.85 mm (0.018 to 0.033 inches) and a Uniformity Coefficient less than 1.75. If the sand bed is calcified, change the sand.
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Desiree CollinsSep 8, 2025
What to do if Intex Water Pump pressure gauge doesn’t work?
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  Nicholas SchmidtSep 8, 2025
  If the pressure gauge on your Intex Water Pump isn’t working, clear any obstructions in the intake by unscrewing it from the 4-way valve.
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pmathisSep 12, 2025
What to do if Intex SF40110 Water Pump air jet valve is leaking?
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  Catherine BradySep 12, 2025
  If the air jet valve on your Intex Water Pump is leaking, first tighten the valve and ensure it’s facing up. If that doesn't solve the issue, try turning the pump ON for a few seconds, then OFF, repeating this 3 times. If the internal seal is dirty, remove the air jet valve, flush out dirt with water, and replace the valve.

Summary

Setup Instructions

Pump Location and Mounting

Guidance on selecting a suitable location and mounting the pump unit for optimal operation and safety.

Sand Tank Installation

Step-by-step instructions for assembling the sand filter tank and its components.

Sand Filter Pump Hose Connection Setup

Operating Instructions

4-Way Valve Positions and Functions

Explanation of different 4-way valve settings and their corresponding water flow directions.

Control Panel Description

Overview of the control panel buttons and LED display readings.

Timer Mode and Manual Operation

Intex Pools Operating Time Table

Non-Intex Pools Operating Time Table

Long Term Storage and Winterization

The Intex Krystal Clear™ Sand Filter Pump, certified model number SF40110, is designed to remove suspended particles from above-ground pools, contributing to clear and hygienically clean water. It is important to note that while the sand filter removes particles, it does not sanitize the pool, and proper pool chemistry management is still required.

Function Description:

The sand filter pump operates by circulating pool water through a sand media, which traps suspended particles. The system features a 4-way valve that allows for various operational modes:

FILTER: This is the normal filtration mode for regular vacuuming and maintaining clear water. Water flows from the pump through the filter media to the pool.
BACKWASH: This mode reverses the water flow to clean the filter media, directing the dirty water from the pump through the filter media to a waste/drain outlet. This is crucial for maintaining filter efficiency and is recommended when the pressure gauge indicates a rise in pressure or when the flow diminishes.
RECIRCULATE: This mode circulates water back to the pool without passing it through the filter media, useful for distributing chemicals without filtering.
DRAIN: This mode allows for vacuuming directly to waste, lowering the pool level, or draining the pool, bypassing the filter media entirely.

The pump is equipped with a control panel featuring an ON/OFF button, a LOCK/UNLOCK button, and a TIMER button. The LED display shows operating hours, allowing users to program the pump for specific durations (1 to 12 hours per cycle) or to run it continuously ("FP" mode). A power-saving mode is also integrated, where the system enters stand-by after a cycle and automatically turns back on in 24 hours.

Important Technical Specifications:

Power: 110-120 Volt AC, 0.8 A
Maximum Working Pressure: 1.0 bar (15 psi)
Effective Filtering Area: 0.03 m² (0.35 ft²)
Maximum Flow Rate: 2 m³/h (550 GPH)
Recommended Filtering Media (Not included): No. 20 silica sand or glass sand. Particle size range 0.45 to 0.85 mm (0.018 to 0.033 inches). Uniformity Coefficient less than 1.75.
Recommended Filtering Media Quantity: 6.5 Kg (14.5 Lbs) of No. 20 silica sand or 5.0 Kg (11 Lbs) of glass sand.
Mounting: The system must be installed on a solid, level, and vibration-free base, protected from weather, moisture, flooding, and freezing temperatures. The pump motor requires free air circulation for cooling. For some regions, securing the product to the ground or a permanent upright base is required, using two bolts and lock nuts (6.4 mm diameter, spaced 163 mm apart).
Electrical Safety: The unit is provided with a ground-fault circuit interrupter (GFCI) and must be connected to a grounding type receptacle. Extension cords, timers, plug adaptors, or converter plugs should not be used. The pool must be installed no closer than 6 feet (1.8 m) from any electrical outlet.

Usage Features:

Setup: Assembly requires one Phillips screwdriver. Sand loading involves carefully pouring the recommended sand into the tank, ensuring the center pipe and filter grid assembly remain centered. The sand should be filled between the "MAX" and "MIN" marked gauge on the center pipe. The 4-way valve is then installed, ensuring proper alignment and secure clamping. Hose connections are made between the pump motor inlet, the 4-way valve water outlet, and the pool's strainer and inlet nozzle. A third hose connection on the 4-way valve (drain/waste outlet) should be directed to a proper draining receptacle.
Initial Startup: Before operation, all hoses must be securely connected, and the correct amount of filter sand loaded. Air must be released from the system by unscrewing the air release valve until water flows out. The initial operation involves a "BACKWASH" cycle to remove impurities and fine sand particles from the new sand media. The pump should be off when changing the 4-way valve position, and the valve handle must be depressed before turning to prevent damage.
Timer Mode: The pump can be programmed to operate for a set number of hours (1-12) each day, automatically activating at the same time. The keypad controls can be locked to prevent unauthorized changes.
Manual Mode: The pump can also be run continuously without the timer by selecting the "FP" mode.
Pool Compatibility: This product is for use with storable pools only, not permanently-installed pools. Operating time tables are provided for various Intex and non-Intex above-ground pool sizes, indicating recommended daily operating hours.

Maintenance Features:

Backwashing: Regular backwashing is essential to clean the filter media. The frequency depends on pool usage, dirt levels, and the pressure gauge reading. When the pressure gauge indicates the yellow zone, it's time to backwash.
Pool Chemistry: The sand filter pump works in conjunction with proper pool chemistry. Daily pH checking and chemical treatment (chlorine, algaecide) are crucial for clear and hygienic water. Concentrated chlorine solutions should be handled carefully to avoid damaging the pool liner.
Troubleshooting: A comprehensive troubleshooting guide addresses common issues such as the motor failing to start, poor filtration, slow flow, pump not working, valve/cover leaks, hose leaks, timer inaccuracies, pressure gauge malfunction, sand flowing back into the pool, and air jet valve leaks. Solutions range from checking electrical connections and hose clamps to cleaning strainers, backwashing, or contacting customer service.
Long Term Storage & Winterization: For long-term storage or winterization, the unit should be switched off, disconnected from power, and all hoses and strainers removed. The drain valve cap should be unscrewed to thoroughly drain the tank. The pump motor should be disassembled from the tank base, and all components allowed to air dry. O-rings should be coated with petroleum jelly. The 4-way valve handle should be depressed and set to the "N" position to allow water to drain. All dry pieces and the pump motor should be stored in original packaging in a dry place with temperatures between 0°C (32°F) and 40°C (104°F). The tank should be covered with a tarpaulin or plastic sheet. Allowing water to freeze will damage the sand filter and void the warranty.