Search  for anything...
HTH

HTH 67289 Swimming Pool Care Algae Guard Ultra, Swimming Pool Chemical, Long Lasting Formula, 32 fl oz

  • Based on 1,860 reviews
Condition: New
Checking for the best price...
$28.22 Why this price?
Holiday Deal · 16% off was $33.77

Buy Now, Pay Later

As low as $7 / mo
  • – 4-month term
  • – No impact on credit
  • – Instant approval decision
  • – Secure and straightforward checkout

Ready to go? Add this product to your cart and select a plan during checkout.

Payment plans are offered through our trusted finance partners Klarna, Affirm, Afterpay, Apple Pay, and PayTomorrow. No-credit-needed leasing options through Acima may also be available at checkout.

Learn more about financing & leasing here.

Selected Option

Free shipping on this product
This item's return window has been extended for the holiday season: FREE refund/replacement until Jan 31, 2026

To qualify for a full refund, items must be returned in their original, unused condition. If an item is returned in a used, damaged, or materially different state, you may be granted a partial refund.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

Availability: In Stock.
Fulfilled by Amazon
Arrives Dec 15 – Dec 22
Order within 11 hours and 20 minutes
Available payment plans shown during checkout
Protection Plan Protect Your Purchase
Checking for protection plans...

Recently Viewed

Style: Ultra Algaecide


Features

  • BENEFIT: Get long-lasting protection from extreme algae; This non-foaming algae control kills and prevents blooms of all algae types
  • OUR STRONGEST ALGAE CONTROL: Kills, prevents and protects against regrowth of heavy green, black and mustard swimming pool algae for up to 3 months
  • NON-FOAMING, FAST-ACTING: Add HTH Algae Guard Ultra directly to your swimming pool water and swim right away
  • COMPATIBLE WITH ALL POOLS: This non-staining formula is great for all swimming pools including vinyl-lined and saltwater systems
  • YOU'RE ALL CLEAR WITH HTH: For best results, use HTH Algae Guard Ultra every 3 months; Works great with HTH Shock products

Description

Get long-lasting protection from extreme algae. Our strongest, non-foaming algae control kills blooms and prevents regrowth for up to 3 months. HTH Algae Guard Ultra is HTH's strongest algae control. It kills, prevents and protects against regrowth of heavy green, black and mustard swimming pool algae for up to 3 months. Its compatible with all pools. The non-staining formula is great for all swimming pools including vinyl-lined and salt water systems. It non- foaming and fast-acting formula means you can add HTH Algae Guard Ultra directly to your swimming pool water and swim right away! For best results, use HTH Algae Guard Ultra every 3 months in combination with other HTH products like HTH shock and HTH chlorine tablets.

Brand: HTH


Item Form: Liquid


Product Benefits: Controls Algae, Maintains Clean Sanitized Water


UPC:


Number of Items: 1


Brand: HTH


Item Form: Liquid


Product Benefits: Controls Algae, Maintains Clean Sanitized Water


UPC: 073187672896


Number of Items: 1


Unit Count: 32.0 Fluid Ounces


Product Dimensions: 2.25 x 4.23 x 9.25 inches


Item Weight: 2.7 pounds


Department: Unisex-Adult


Manufacturer: Innovative Water Care


Item model number: 67289


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Dec 15 – Dec 22

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

  • Klarna Financing
  • Affirm Pay in 4
  • Affirm Financing
  • Afterpay Financing
  • PayTomorrow Financing
  • Financing through Apple Pay
Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

Similar Products

Top Amazon Reviews

    • As far as I can tell this stuff really works to prevent algae growth.
Style: Advanced Algaecide
When we put our pool up many years ago we didn't have any great options that kept it away from trees. I had to either deal with the leaves falling off the trees into the pool or cut the trees down. I was not going to cut the trees down. Every year it seems I am having to deal with at least two outbreaks of algae growth in the pool, possibly due to the leaves falling into the pool. Before I opened the pool this year I did some research on preventing algae. What I found was make sure the pool water is stabilized, chlorine level is always kept at the proper level and all other required chemicals are kept at their proper level. I've been doing that every year but still got algae. This year I decided to use an algaecide along with regular chemical maintenance. I followed the instructions for initial treatment for my pool size and added that amount. I'm also adding 2 ounces to my 15,000 gallon pool every 5 days. A bit more than recommended, but to date I have not had any algae problems. And now that I said that I'll probably have an issue. :-) But it's getting late in the season for where I live, we close the pool right after labor day, and so far no issues with algae. I'm going to attribute my lack of algae growth to this product. The addition of this algaecide is the only thing that's changed from previous years when I was having an algae problem. And it's been hot this year and heat typically aids in algae growth. Product seems to be working well for me. It's worth a shot if you have algae issues. ... show more
Reviewed in the United States on August 15, 2025 by JSF
    • This stuff works well
Style: Advanced Algaecide
Have used this on my inground pool during summer months when I have problems w green algae. Clears the pool pretty fast. It does on occasion leave bubbles on surface for a day or 2 so recommend not using pool for 24 to 48 hrs. But it does clear the pool of algae
Reviewed in the United States on November 25, 2025 by Bob Bojorquez
    • This stuff WORKS!!!
Style: Advanced Algaecide
I've tired so many different products to kill algae in the pool. This stuff is amazing and super concentrated. One bottle can last a few months and keep your pool algae free.
Reviewed in the United States on August 27, 2025 by Michael P. Gleeson Md
    • Leaking bottles
Style: Advanced Algaecide
This is a very good product. Works better than others that I have tried. However one of my ordered was undeliverable it leaked so badly and the next one that I received was leaking all around the bottle.
Reviewed in the United States on August 1, 2025 by Dianne T. Gordon
    • Algae Guard
Style: Advanced Algaecide
Great product! Gives great results in terms of water clarity!
Reviewed in the United States on November 6, 2025 by Khadyja
    • Algae Killer
Style: Ultra Algaecide
I thank the gentleman that steered buyers to this product. It’s likely my fault for not maintaining my pools chemistry balance, but each year I get these spots that I believe is mustard algae. Chlorine resistant yellowish looking spots that I just couldn’t get rid of. This product has worked to stop them. I may have a few small residual spots after treatment but I need a new plaster job anyway. I have a small waterfall and get very little sudsing, can swim within 24 hours and don’t turn green like someone may have mentioned. I keep my dog (who drinks pool water) away until I’ve added more water to the pool or it rains. A very good product to fight algae when you’ve let your guard down! ... show more
Reviewed in the United States on August 29, 2025 by Old Beginner
    • Works great!
Style: Advanced Algaecide
Works great!
Reviewed in the United States on November 2, 2025 by Vanessa C
    • Absolutely great product
Style: Advanced Algaecide
This is a great product to keep your pool clean and blue.
Reviewed in the United States on October 26, 2025 by Nick

Can't find a product?

Find it on Amazon first, then paste the link below.
Checking for best price...