How Does A Sump Pump Work: A Detailed Guide

crawl space sump pumps
August 11, 2024

Sump pumps help keep homes dry and safe from water damage. They’re frequently installed in homes that experience frequent rainfall or snow or have a high water table. They are designed to automatically evacuate water from your basement or crawl space in order to prevent flooding or damage. High-quality sump pumps protect your home from water damage and help keep your foundation safe. Installing a sump pump can save you money in the long run since it keeps you from having to deal with flooding or extensive water damage. In this guide, we’ll explore how sump pumps work and the different types of pumps available.

What is a Sump Pump?

A sump pump is a machine that moves water out of basements or crawl spaces. They are installed in an enclosed hole called a sump pit or basket. This pit is dug at the lowest point of your basement or crawl space to make it easy for water to naturally flow into the pit or be directed there by drain tile. The pump is activated by rising water levels, usually through a float switch. This allows the pump to automatically evacuate any water that begins to enter your home. Water is pumped out of the basement or crawl space through a discharge pipe. In most discharge pipes, a check valve stops the water from flowing back into your house. The pump keeps running until the water level drops, lowering the float. This turns off the motor. If the pump stops working, you might need to fix the sump pump by checking the float, cleaning out dirt and debris, or replacing aging parts. This keeps water away from the house’s foundation and helps prevent flooding.

Different Types of Sump Pumps

There are several types of sump pumps, each designed for specific situations. Here are five of the most common types:

1. Pedestal Sump Pumps

Pedestal pumps have a motor mounted on a tall shaft, with the pump at the bottom. The motor stays above water level while the pump sits in the sump pit. They’re used in the basement where the sump pit is narrow or shallow or when easier access to the motor is needed.

Pros:

  • Easier to repair and maintain
  • Less expensive
  • Longer motor lifespan due to being above water
  • Easy to inspect

Cons:

  • Louder
  • Takes up more vertical space
  • Less visually appealing
  • Can be a tripping hazard
  • Not suitable for finished basements

2. Submersible Sump Pumps

These are compact units that sit underwater in the sump pit. The motor and pump are combined in one waterproof housing. They’re used in finished basements or areas where space is limited.

Pros:

  • Quieter operation
  • Compact design
  • Efficient water removal
  • Less prone to clogging
  • Can handle debris more effectively

Cons:

  • More expensive initially
  • Harder to repair
  • May have a shorter motor lifespan due to constant water exposure
  • More difficult to access maintenance
  • Requires a larger sump pit

3. Water-Powered Sump Pumps 

These pumps use water pressure from your home’s plumbing to create suction that removes water from the pit. They don’t need electricity to function. They’re often used as backup pumps in areas with reliable water pressure, especially during power outages.

Pros:

  • Work without electricity
  • Can run continuously
  • Low maintenance
  • No battery replacement is required
  • Simple mechanism with fewer parts that can wear out

Cons:

  • Requires consistent water pressure
  • Increases water usage and bills
  • Not suitable for well-systems
  • Less powerful than electric pumps

4. Battery-Powered Sump Pumps 

These are standalone pumps that run on battery power. They typically have their own float switch and discharge pipe. They’re used as backup systems during power outages to ensure continuous protection against flooding.

Pros:

  • Works continuously during power outages
  • Easy to install
  • Provides additional protection
  • Some models provide alerts that notify you during power outages

Cons:

  • Limited operation time
  • Needs regular battery checks and replacement
  • Less powerful than main pumps
  • Additional cost for battery and charger

5. Combination Sump Pumps

These systems include a primary pump (usually electric) and a battery backup pump in one unit. They provide dual protection against flooding and power outages and are used in areas prone to flooding and frequent power failures.

Pros:

  • Offers dual protection<
  • Convenient, all-in-one system
  • Can be cost-effective in the long run
  • Often include alarm systems

Cons:

  • More complex to install
  • Higher upfront cost
  • May need a larger sump pit
  • More components that could potentially fail
  • May require increased maintenance

Pros and Cons of Sump Pumps 

Let’s first take a look at the advantages of having a sump pump in your home:

Pros of Sump Pumps

  1. Water Removal

Sump pumps efficiently extract excess water from basements and crawl spaces. This is crucial for preventing flooding during periods of heavy rainfall or rapid snowmelt.

  1. Wall and Foundation Protection 

By controlling moisture, sump pumps prevent your foundation from cracking, shifting, settling, or leaking, maintaining its overall integrity. They also prevent water damage that could lead to water stains, standing water, or damage to drywall, insulation, furniture, and valuables.

  1. Dry Environment

Sump pumps create a drier basement or crawl space. This improved environment enhances indoor air quality, deters pests, and significantly reduces the likelihood of mold and fungus growth.

  1. Flooding Coverage

Some insurance providers offer specialized coverage for water damage caused due to sump pump failure. If you do not have a sump pump installed, you may not be covered if your home floods. This additional protection can be valuable for homeowners in flood-prone areas.

  1. Effectiveness

Compared to external waterproofing methods, sump pumps provide more reliable and long-lasting protection. They actively remove water, whereas passive systems may break down or fail over time.

  1. Reliability

When properly maintained, sump pumps are highly dependable waterproofing solutions. They can be equipped with alarms to alert homeowners about high water levels and battery backups to keep them working during power outages.

Cons of Sump Pumps

Here are some of the drawbacks of sump pumps:

  1. Electricity Dependence

The majority of sump pumps require electricity to function. This can be problematic during power outages, which often occur during severe weather events that increase the risk of flooding.

  1. Installation Requirements

To install a sump basket, a pit must be excavated on the floor. This process can be disruptive and may deter some homeowners.

  1. Appearance

Many homeowners find sump pumps visually unappealing. The exposed pit and pump assembly can detract from the aesthetics of a finished basement.

  1. Sump Pump Cost

The cost of installing a sump pump depends on the cost of labor, any excavation necessary, and the type of pump you require.

  1. Radon Risk

The pit required for a sump pump can potentially allow radon gas to enter the home. This risk may necessitate additional testing and mitigation measures, adding to the overall cost and complexity of the system. To mitigate this risk, we offer radon-sealed lids on all of our sump baskets and provide radon-sealed covers if you already have a pump installed.

Installing a Sump Pump in a Basement

The process of installing a sump pump in a basement involves the following steps:

Step 1: Choose The Location

We find the lowest point in your basement, usually near a corner and an exterior wall. We ensure it’s close to a power source or plan to install one. This spot should be where water naturally collects.

Step 2: Mark And Break The Concrete

We outline the sump basin on the floor using chalk and cut along this line with a concrete saw. Then, using a jackhammer, we break up the concrete within this area. We remove all debris carefully to avoid damaging surrounding areas.

Step 3: Excavate The Pit

We excavate the soil beneath the broken concrete, making the hole about 6 inches deeper than your sump basin. This extra depth allows for a gravel base, which improves drainage and stability.

Step 4: Prepare And Install The Basin

If your basin isn’t pre-perforated, we drill holes in its sides to allow water entry. We use landscaping fabric to prevent soil infiltration. Next, we place a layer of gravel at the bottom of the hole, then set the basin in, ensuring it is level and flush with the floor.

Step 5: Install The Pump

We place the sump pump inside the basin. We usually recommend purchasing a stand as well so that the pump can be placed securely.  This prevents debris from clogging the intake. We make sure the pump is positioned correctly for the float switch to operate properly.

Step 6: Connect The Discharge Pipe

We attach PVC piping to the pump’s outlet. This pipe is routed outside and extended away from your foundation, ensuring a proper slope for water flow.

Step 7: Wire The Pump

We connect the pump to a GFCI-protected outlet and ensure all electrical connections are secure and protected from water.

Step 8: Add Gravel And Seal

We fill the space around the basin with gravel to improve drainage. We seal any gaps around the basin and where the discharge pipe exits the house, preventing water seepage.

Step 9: Test The System

Finally, we fill the sump pit with water to check that the pump activates at the correct level and efficiently drains the pit. We will also verify that water is properly discharged outside and away from your home.

Step 10: Finish The Installation

Before we leave, we clean up the job site and dispose of any debris properly.

Common Sump Pump Problems

Sump pumps can face various issues that affect their performance. Here are the most common sump pump problems and how to address them:

1. Float Switch Issues

The float switch controls the pump’s on/off cycles based on water levels. If it malfunctions, the pump may not activate or shut off properly. To diagnose float switch issues, pour water into the pit and observe the float’s movement. Check for obstructions and test the switch’s electrical connection. You may need to adjust the switch position, clear out debris, or replace the entire mechanism if necessary.

2. Clogged Intake or Discharge Pipes

Blockages in these pipes can severely limit water flow. Signs include gurgling noises and reduced output. Inspect pipes visually and test the water flow. For minor clogs, try snaking or flushing the pipes with high-pressure water. Chemical cleaners may help with sludge buildup. Severe blockages may require professional maintenance like hydro-jetting.

3. Motor Problems

Motor issues can cause complete pump failure or reduced efficiency. Listen for unusual noises and see if the motor feels excessively hot. Consult the manual for potential reset procedures. Some fixes include realigning the motor shaft or replacing worn components like bearings. For older units, full motor replacement might be necessary.

4. Lack of Maintenance

Regular upkeep is essential for optimal pump performance. Neglect can lead to buildup, corrosion, and mechanical issues. Perform routine cleaning, lubricate moving parts, and inspect all the components regularly. Your inspection should include checking discharge pipes and vents for potential obstructions.

5. Improper Sump Pit Size

An incorrectly sized pit can cause overly frequent cycling or inadequate water removal. Compare your pit dimensions to the manufacturer’s recommendations. Unfortunately, modifying pit size is usually not a DIY task due to potential structural and waterproofing risks.

6. Age and Wear

Sump pumps typically last 3-5  years with proper maintenance. Signs of aging include decreased performance, intermittent operation, and strange noises. For pumps nearing the end of their lifespan, replacing individual worn components might extend their use, but full replacement is often more cost-effective in the long term.

7. Incorrect Installation

Poor installation can cause various issues, including improper drainage, misaligned switches, and flow problems. Check for proper pit depth, pump positioning, and pipe placement. Ensure appropriate venting and electrical connections. Most installation issues require professional assessment and correction.

8. Power Surges and Voltage Fluctuations

Electrical inconsistencies can damage pump components over time. Symptoms include erratic cycling, overheating, or complete failure. Protective measures or built-in voltage monitoring may extend the lifespan of your pump.
Sump pumps protect homes from water damage, especially in flood-prone areas. While different

t types of sump pumps offer various benefits, they all serve the crucial purpose of keeping your home dry. Regular maintenance and troubleshooting of sump pump problems are key to ensuring these systems work well when you need them the most. Choosing a quality pump and knowing how it works helps homeowners protect their property year-round. For expert sump pump installation and repair, contact SafeBasements today! We’ll help you choose and maintain the right system for your home.

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