HTH™ Pool Care D.E. Filter Aid

DE Pool Filter Powder for Cloudy Pool Water

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  • Child on a red and white inner tube in a pool with HTH Pool Care branding.

HTH™ Pool Care D.E. Filter Aid

DE Pool Filter Powder for Cloudy Pool Water

HTH™ Pool Care D.E. Filter Aid is designed to help your pool’s D.E. filter work smarter and more efficiently.

  • This powerful filter aid boosts your system’s ability to trap fine dirt, debris, and other particles that can cloud your water—helping you maintain a consistently clean, crystal-clear pool.
  • By enhancing filtration performance, it restores flow and extends the life of your D.E. filter for maximum results.
  • Safe for all pool types, including saltwater systems. 

HTH™ is here to help you enjoy brilliantly clear water all season long. 

Product Benefits

A D.E. filter enhancement

D.E. stands for diatomaceous earth, a filter media that traps particles as much as 20 times smaller than sand or cartridge filters.

Beautifully blue water

The HTH™ D.E. Filter Aid keeps your D.E. pool filter working at maximum performance for results you can see.

Compatible with all pools

Our DE pool filter powder is great for all swimming pools that use D.E. filters, including salt water systems.

You’re all clear with HTH

Use the HTH™ D.E. Filter Aid ensures your swimming pool water is crystal clear and ready for summer.

How to Use

How to Use

Why You Should Use This Product: This filter aid is designed for use with D.E. filters on pools and spas. It helps remove extremely small particles, restores filter efficiency, and improves overall water clarity.

Before Use: Test pool water and ensure proper water balance before adding this product.

Application Instructions

  1. Use approximately 1.5 lb of filter aid per 10 sq ft of filter surface area. Refer to the filter manufacturer’s guide for exact surface area.
  2. Slurry the D.E. Filter Aid in water so it pours easily. Mix 1 part powder with approximately 10 parts water until the mixture has a milky appearance.
  3. With the pump running, slowly pour the mixture into the skimmer nearest the filter.

Opening Your Pool

If the D.E. filter was cleaned and stored as part of the previous season’s closing process, reassemble the filter according to the manufacturer’s instructions before adding this product.

If the filter was not cleaned at the end of the previous season, clean it first, then follow the application instructions above.

Winterizing

Follow the filter manufacturer’s recommendations for closing or winterizing procedures. Failure to properly follow instructions could damage the filter from freezing.

D.E. Filter Aid Dosage

Filter Area (Sq Ft) D.E. Filter Aid (lb)
10 1.5
20 3.0
30 4.5
40 6.0
50 7.5

Ingredients

Ingredients

Active Ingredient:

Contains amorphous silica.

Safety, Storage, and Disposal

Safety

Use this product only as directed. Avoid breathing dust and avoid contact with eyes.

Wear goggles and use only with adequate ventilation.

Wash hands thoroughly after handling.

For complete safety information, warnings, and first aid instructions, refer to the product label.

First Aid

If inhaled, move to fresh air. If symptoms persist, contact a medical professional.

If product gets in eyes, rinse slowly and gently with water for 15–20 minutes and seek medical advice if irritation persists.

Storage and Disposal

Store in a cool, dry, well‑ventilated area.

Use entire contents when possible. Dispose of unused product in accordance with state and local regulations.

For full storage, disposal, and emergency handling instructions, refer to the product label.

Frequently Asked Questions

  • What is D.E. (diatomaceous earth) filter aid, and when do I need it?

    HTH™ Pool Care D.E. Filter Aid is a powder made from the fossilized remains of microscopic aquatic organisms called diatoms. Added to a D.E. filter after every backwash, it forms a porous coating on the filter grids that traps extremely fine particles and restores filtration efficiency. You will also need to add fresh D.E. powder when starting the filter and after any complete filter cleaning.

  • How do I add HTH D.E. Filter Aid to my pool filter?

    After backwashing a D.E. filter, the old D.E. coating is washed away and must be replaced. With the pump running, mix the label-directed amount of HTH™ Pool Care D.E. Filter Aid with water to form a slurry, then pour it slowly through the skimmer nearest the filter. The pump will draw the slurry into the filter and coat the grids. Refer to the filter manufacturer’s manual for the exact amount required for the filter’s surface area.

  • Can I use HTH D.E. Filter Aid in a sand filter?

    Adding a small amount of D.E. powder to a sand filter is sometimes used to improve fine-particle filtration. Add only the amount permitted by the filter manufacturer through the skimmer with the pump running. The D.E. can coat the sand and temporarily improve its ability to trap finer particles. Backwash when filter pressure rises.

  • How often do I need to add HTH D.E. Filter Aid?

    Add HTH™ Pool Care D.E. Filter Aid after every backwash because backwashing removes the old D.E. coating along with trapped debris. Add fresh D.E. powder when starting the filter and after any complete filter cleaning. For sand filters supplemented with D.E. powder, add a small maintenance dose only as permitted by the filter manufacturer.

  • Is HTH D.E. Filter Aid safe for pool water and swimmers?

    When used correctly, HTH™ Pool Care D.E. Filter Aid remains inside the filter and does not enter the pool during normal operation. If a filter grid cracks or a seal fails, D.E. powder may return to the pool and appear as white powder on the pool floor. Inspect filter grids regularly and replace damaged components. Always follow the product label and filter manufacturer’s guidance.

  • What is included in the HTH Pool Care Kit?

    HTH™ Pool Care Kit is an all-in-one seasonal bundle designed to help open or close a pool. It includes two 1 lb bags of HTH™ Pool Care Shock Ultra, one 12 oz bag of HTH™ Pool Care Algae Guard Granules, one 1.25 lb bag of HTH™ Pool Care Metal, Stain & Scale Control, and 10 HTH™ Pool Care 6-Way Test Strips. Each kit treats up to 20,000 gallons.

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Quick Pool Tips

  • Always read product label directions prior to using and use only as directed

  • Always add chemicals to pool water, never the other way around

  • Never add chemicals to pool water when people are in the pool

  • Warning symbol with a triangle and exclamation mark on a blue background

    Never mix products together

  • Always store pool products in a cool, dry location and out of direct sunlight