top of page
Pool-and-Hot-Tub-Insights-logo
Search

Restore Your Filter Flow: How to Replace the Lateral Assembly in a Hayward Sand Filter

Sep 14
2 min read

If your filter isn’t performing like it used to, the issue could be buried deep inside—literally. In this tutorial, we’ll show you how to replace the lateral assembly in a Hayward sand filter, a critical step to restoring your filtration system and keeping your pool water clean and clear all season long.



Key Takeaways:

  • Lateral assemblies ensure even water flow through your filter sand.

  • Always shut off water flow and power before beginning disassembly.

  • Use a sand shield or cup to protect the center pipe during sand refills.

  • Pre-fill the tank with water to cushion the laterals when adding new sand.


Step-by-Step Process:

  1. Turn off the pump and close shutoff valves or use Hayward caps.

  2. Remove the C-clamp and detach the multiport valve.

  3. Drain water by removing the tank’s bottom drain cap.

  4. Remove old sand using a scoop or shop vac.

  5. Lift out the old lateral assembly; install the new one with laterals fully extended.

  6. Fill the tank ⅓ with water, then use a sand shield or cup over the center pipe.

  7. Slowly pour in new sand until the tank is ¾ full.

  8. Reconnect the valve, align and secure the C-clamp.

  9. Set the valve to “FILTER” before restarting the system.


Resources and Explanations:

  • -Lateral Assembly – The internal manifold that disperses water evenly through the filter sand.

  • -Sand Shield or Cup – Protects the center pipe from getting clogged with sand during refill.

  • -Hayward Cap or Shutoff Valves – Used to block water flow when plumbing lacks manual valves.

  • -C-Clamp – Holds the valve and filter tank tightly together; must be aligned evenly to prevent leaks.


FAQs:

Q1: How do I know my lateral assembly needs replacement?

A: Signs include poor filtration, sand in the pool, or reduced water flow.


Q2: What kind of sand should I use when refilling?

A: Use only #20 grade silica sand, specifically designed for pool filters.


Q3: Can I reuse the old sand after replacing the laterals?

A: It’s not recommended—fresh sand ensures optimal filtration and avoids contamination.


Q4: Why should I add water before the sand?

A: Water cushions the laterals and prevents damage during the refill process.


Q5: What if I can’t align the C-clamp properly?

A: Loosen and reposition the valve gently. Forcing it may damage the seal or tank threads.


At The Great Escape, we’re here to help you protect your pool investment with clear, reliable how-to guidance. If you have questions or need tools or supplies, visit your local store—our team is always happy to help!

Comments

bottom of page