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Jandy CS100 - User Manual

Jandy CS100
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H0285700 A
Installation and
Operation Manual
Jandy
®
CS Single
Element Cartridge
Pool and Spa Filters
Models
CS100 and CS150
WARNING
FOR YOUR SAFETY - This product must be installed and serviced by a professional pool/
spa service technician. The procedures in this manual must be followed exactly. Improper
installation and/or operation can create dangerous high pressure which can cause the lter
lid to be blown off, possibly causing death, serious injury or property damage. Improper
installation and/or operation will void the warranty.
Before installing this product, read and follow all warning notices and instructions that
accompany this lter. Failure to follow warning notices and instructions may result in
property damage, serious injury, or death.
Installation and Operation Data

Table of Contents

Questions and Answers

  • A
    angela19Aug 14, 2025
    How to fix low water flow in Jandy Water Filtration System?
    • A
      arthurhernandezAug 15, 2025
      Low water flow in your Jandy Water Filtration System can stem from several causes. Start by checking and cleaning the filter system strainer baskets, as they may be dirty. Inspect all connections between the pool intake and pump for air leaks on the suction side. Look for any restrictions or blockages in the suction or return lines, such as debris or partially closed valves. The filter cartridge might need attention, so clean or replace it as instructed. Ensure the pool water level is high enough, above the pump inlet line. Prime the pump by filling it with water at the basket and replacing the lid. If the pump impeller vanes are blocked or the pump is operating under speed due to low voltage, a technician or electrician is required.
  • J
    Jeffrey WardAug 17, 2025
    Why does dirt return to the pool with Jandy Water Filtration System?
    • S
      Shannon GregoryAug 18, 2025
      If dirt returns to the pool when using your Jandy Water Filtration System, it could be due to a hole in the filter cartridge; in this case, replace the filter cartridge as instructed. A worn o-ring seal inside the filter could also be the culprit; replace the o-ring. Finally, the filter might not be assembled correctly; reassemble it following the instructions.
  • T
    timothy45Aug 21, 2025
    Why is the water flow low in my Jandy Swimming Pool Filter?
    • O
      Olivia BryanAug 21, 2025
      Low water flow in your Jandy Swimming Pool Filter can be caused by several factors. Check and clean the filter system strainer baskets. Inspect all connections between the pool intake and pump for air leaks. Look for any restrictions or blockages in either the suction or return lines. The filter cartridge may need cleaning or replacement. Ensure the pool water level is above the pump inlet line. Fill the pump with water at the basket and replace the lid. If the pump impeller vanes are blocked or the pump is operating under speed (low voltage), a technician or electrician may be required.
  • D
    Diane BrownAug 25, 2025
    How to stop dirt returning to the pool from my Jandy Swimming Pool Filter?
    • J
      jpowellAug 25, 2025
      If dirt is returning to your pool from the Jandy Swimming Pool Filter, it could be due to a hole in the filter cartridge, a worn o-ring seal inside the filter, or the filter not being assembled correctly. Replace the filter cartridge per instructions, replace the o-ring, and reassemble the filter per instructions.
  • M
    msmithAug 28, 2025
    Why is the water not clear in my Jandy Water Filtration System?
    • M
      Matthew LambertAug 28, 2025
      If the water in your pool isn't clear, it could be due to several reasons. You might not have enough disinfectant; in that case, check and adjust the disinfectant level. The pool chemistry could be off, so test and adjust it accordingly. Heavy use or dirt can also affect water clarity; adjust the filter time or water chemistry to compensate. Ensure the pump runs long enough by increasing its run time. A dirty filter can also cause this issue; clean it following the instructions. Finally, check for holes in the filter element and replace the filter cartridge if needed.
  • G
    Gregory CruzAug 31, 2025
    What causes short filter cycles in Jandy Water Filtration Systems?
    • P
      Pamela YangAug 31, 2025
      Short filter cycles in your Jandy Water Filtration System can be caused by a few things. Algae clogging the filter is one possibility, so check the disinfectant content. Incorrect water chemistry can also be a factor; check the pH, total alkalinity, and TDS. Make sure strainer baskets are being used and are not broken; replace them if necessary. The pump output might exceed the filter's design flow rate, so check the pump performance. Lastly, ineffective cleaning can cause this, so clean or replace the filter cartridge as instructed.
  • L
    Larry MorrisSep 3, 2025
    What to do if there is high pressure on start-up with Jandy Water Filtration System?
    • M
      martinezsharonSep 4, 2025
      High pressure on start-up in your Jandy Water Filtration System can occur due to a few reasons. A small eyeball fitting in the pool or spa could be the cause; replace it with a larger diameter fitting. Check the return line for partially closed valves and fully open them. The pump might be too large for the system; check the pump and filter selection. Lastly, a dirty filter cartridge can cause this issue; clean it as instructed.
  • K
    Kyle HardinSep 6, 2025
    How to make water clear in my Jandy Swimming Pool Filter?
    • S
      Sabrina SmithSep 6, 2025
      If the water in your pool isn't clear, several factors could be the cause. Make sure to check and adjust the disinfectant level and test and adjust the water chemistry. Adjust the filter time and/or water chemistry. You may need to increase pump run time. Clean the filter following the instructions, and if there's a hole in the filter element, replace the filter cartridge.
  • M
    Megan MartinezSep 10, 2025
    Why is there high pressure on start-up in my Jandy Swimming Pool Filter?
    • B
      bridget17Sep 12, 2025
      High pressure on start-up in your Jandy Swimming Pool Filter could be due to a small eyeball fitting in the pool/spa, a partially closed valve on the return line, a pump that is too large, or a dirty filter cartridge. Consider replacing the fitting with a larger diameter one. Check and fully open all valves on the return line. Ensure the pump and filter are appropriately sized. Clean the filter cartridge following the instructions.

Summary

Section 1. Safety Information

1.1 Important Safety Warning

Crucial safety warnings regarding high pressure, air in system, and pressure testing procedures.

1.2 General Safety Instructions

Essential safety guidelines for installers and operators, including proper use and maintenance.

Section 3. Installation Instructions

3.1 Filter Location

3.2 Filter Preparation

3.3 Filter Installation

Detailed steps for connecting pipes, installing pressure gauge, and securing the filter unit.

3.4 Locking Ring;Tank Top Assembly Installation

Section 4. Start-Up and Operation

4.1 New Pool and Seasonal Start-up

Step-by-step guide for initial system startup and seasonal re-commissioning.

Section 5. Filter Disassembly and Assembly

5.1 Filter Element Removal

Section 6. Maintenance

6.1 General Maintenance

6.3 Cleaning the Filter Cartridge

Section 7. Winterizing

Section 8. Troubleshooting

Jandy CS100 Specifications

General IconGeneral
TypeCartridge Filter
Filtration Area100 sq ft
Flow Rate100 GPM
Weight34 lbs
Max Working Pressure50 psi
ManufacturerJandy
Max Operating Pressure50 psi
Inlet/Outlet Size2"

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