HTH™ Pool Care Algae Guard 10

Algae Control for Pools

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

HTH™ Pool Care Algae Guard 10

Algae Control for Pools

HTH™ Pool Care Algae Guard 10 is a non-foaming, fast-acting pool algaecide that kills and prevents stubborn green algae for cleaner, clearer water.

  • This reliable algaecide for pools works quickly! Simply add it directly to the water, wait 15 minutes, and jump right back in.
  • Safe for all pool types, including vinyl-lined and saltwater systems, it helps keep your swimming pool beautifully balanced and worry-free.

Protect your pool from green outbreaks and enjoy sparkling results all season long with confidence. 

Product Benefits

Take your pool from green to clean

Our algae control for pools is formulated to quickly kill and prevent green algae.

Non-foaming, fast-acting algaecide

Add HTH™ Algae Guard 10 directly to your swimming pool water and swim just 15 minutes after.

Compatible with all pools

This algae control for pools is great for all swimming pools including vinyl-lined and salt water systems.

You’re all clear with HTH™

For best results, use HTH™ Algae Guard 10 as part of your weekly maintenance routine. Works great with HTH™ Shock products.

How to Use

How to Use

Why You Should Use This Product: Algae Guard 10 is a non‑foaming algaecide that kills and prevents green algae. When used regularly, it helps keep pool water clear and allows swimmers to enjoy the pool immediately after application.

Before Use: Test and balance pool water. Always follow label directions and keep the pump running while adding this product.

Initial Dose

Add this product at the beginning of the season or when algae is first noticed.

Pool Size (Gallons) Dosage (Fl Oz)
1,000 2.6
2,500 6.4
5,000 13
10,000 26
15,000 38

Maintenance Dose

Add this product every 3–5 days to prevent algae growth.

Pool Size (Gallons) Dosage (Fl Oz)
1,000 0.6
2,500 1.6
5,000 3.2
10,000 6.4
15,000 9.6

Visible Algae

If algae is visible, apply the Initial Dose and vacuum the pool after 24 hours to remove dead algae. Repeat treatment if algae returns. Once algae is eliminated, resume the Maintenance Dose.

Closing Your Pool

When the swimming season is over, add one Initial Dose of this product to help control algae growth during the winter and support easier pool opening the following season.

Ingredients

Ingredients

Active Ingredients:

N‑Alkyl (60% C14, 30% C16, 5% C12, 5% C18) Dimethyl Benzyl Ammonium Chlorides: 9.96%

N‑Alkyl (60% C14, 30% C16, 5% C12, 5% C18) Methyl Benzyl Ammonium Chlorides: 0.04%

Other Ingredients: 90.00%

Total: 100.00%

Safety, Storage, and Disposal

Safety, Storage & Label Guidance

Use this product only as directed and avoid contact with eyes and skin.

Wear protective eyewear and gloves when handling.

Do not mix with other chemicals.

Store in its original, tightly closed container and keep out of reach of children.

For complete safety precautions, first aid instructions, and disposal information, always refer to the product label.

Frequently Asked Questions

  • What is HTH™ Algae Guard 10, and when should I use it?

    Use HTH™ Algae Guard 10 as a weekly preventive treatment when your pool is already clear and chemically balanced to help stop green algae before it starts.

  • What is the difference between HTH™ Algae Guard 10, HTH™ Algae Guard Advanced, and HTH™ Algae Guard+ Ultra?

    HTH™ Algae Guard 10 provides weekly green algae prevention for clear, balanced pools. HTH™ Algae Guard Advanced provides weekly protection against green, mustard, and black algae. HTH™ Algae Guard+ Ultra protects against all three algae types for up to 30 days. Choose the product that best matches your pool maintenance needs.

  • How do I use HTH™ Algae Guard 10 in my pool?

    Chlorine above 5 ppm can deactivate algaecide, so wait 24 hours after shocking and confirm chlorine has returned to 1–4 ppm. Then add the recommended dose of HTH™ Algae Guard 10 to the pool water with the pump running, distributing it around the pool's edge.

  • Can HTH™ Algae Guard 10 be used in a saltwater pool?

    Yes. HTH™ Algae Guard 10 is compatible with saltwater, vinyl liner, and all standard pool types. Saltwater pools are not immune to algae—the chlorine generator can struggle during heat waves or periods of heavy pool use. A weekly algaecide treatment is a smart addition to any saltwater pool maintenance routine.

  • How often should I add algaecide to my pool?

    For maintenance, add algaecide once a week during the swim season. Increase the frequency during stretches of hot weather, heavy rain, or periods of heavy pool use—all conditions that stress your chlorine and increase the risk of algae. Consistent weekly dosing is easier and more cost-effective than treating an active algae bloom.

  • Will HTH™ Algae Guard 10 clear an already-green pool?

    HTH™ Algae Guard 10 is formulated for prevention and light maintenance—it is not strong enough to clear an existing algae bloom on its own. For an existing algae bloom, shock the pool with 2–3 lbs of shock per 10,000 gallons, brush all surfaces, and run the filter continuously. Once chlorine levels return to 1–4 ppm, add algaecide. For severe algae blooms, step up to HTH™ Algae Guard+ Ultra or HTH™ Green to Blue Advanced.

  • Does algaecide affect pH or chlorine levels?

    HTH™ Algae Guard 10 has minimal effect on pH when used as directed, though some algaecides may cause temporary foaming. Test pool water before and after use. Chlorine above 5 ppm can deactivate algaecide, so wait for levels to return to normal.

Reviews

Related Products

Discover products our customers trust and recommend

Block Chlorine Lock with Cal Hypo

Discover how Cal Hypo pool chlorine works without CYA to prevent chlorine lock and keep pool water clear, balanced, and safe for swimmers.

Read More

Simplified Pool and Spa Care with HTH™ Test to Swim

Simplify pool and spa water testing with the HTH™ Test to Swim™ App. Scan your test strip, get instant results, and receive personalized pool care recommendations.

Read More

Transform Your Pool with Brilliance™

Looking for clearer pool water? Discover how HTH™ Brilliance Cal Hypo Chlorine Tablets improve water clarity and prevent chlorine lock.

Read More
 

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