HTH Pool Care Algae Guard Ultra Plus — Liquid, 28 fl oz — Pool Algaecide for All Pool Types
HTH Pool Care Algae Guard Ultra Plus — Liquid, 28 fl oz — Pool Algaecide for All Pool Types
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HTH Pool Care Algae Guard Ultra Plus — Liquid, 28 fl oz — Pool Algaecide for All Pool Types

4.7 stars out of 231 reviews
(4.7)|
231 ratings
HTH Pool Care Algae Guard Ultra Plus — Liquid, 28 fl oz — Pool Algaecide for All Pool TypesHTH Pool Care Algae Guard Ultra for Swimming Pools Liquid 28oz
Size:28 OZ
Pack Size:Single

Key item features

  • Potent Algae Eliminator: This strongest algaecide formula from HTH Pool Care effectively kills and prevents even the most stubborn green, black, and mustard algae.
  • Extended Protection: The long-lasting formula treats pool water for up to 90 days after application, providing sustained algae control.
  • Monthly Treatment: For optimal results and continuous algae prevention, the product is designed for monthly application.
  • Rapid Action: This fast-acting and effective liquid algaecide allows for immediate swimming after treatment.
  • Universal Pool Compatibility: Suitable for use in all types of swimming pools, ensuring broad applicability.
  • Non-Foaming Formula: The non-foaming and non-staining liquid helps reduce chlorine usage while maintaining water clarity.
  • Convenient Liquid Form: Provided in a 28 fl oz liquid format for easy application and distribution in pool water.
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Current price is $26.8896.0 ¢/fl oz
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About this item

Product details

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Customer ratings & reviews

4.7 out of 5 stars
stars231 ratings172 reviews
How item rating is calculated
  1. 5 stars81% (187)
  2. 4 stars13% (31)
  3. 3 stars3% (7)
  4. 2 stars1% (3)
  5. 1 star1% (3)

Reviews summary

Pros
  • : Has a subtle, chemical clean scent.
  • : Lasts for an extended period after application.
  • : Allows immediate use without irritation.
  • : Helps maintain clean water without strong odor.
  • : Directions are easy to follow and simple.
Neutral
  • : Offers competitive pricing, but can be seen as expensive by some.
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Showing 1-3 of 172 reviews

Sep 11, 2025
Robert
Item details
Size: 28 OZ
Multipack quantity: 1
5 out of 5 stars review

Verified Purchase

This stuff is GRRRRREAT! GREAT, GREAT, GREAT. Between sprinkling this product, 1 cup of chlorine %26 sprinkling some drop out on the top of pool surface x1 a week, with a ZERO leaf %26 debris policy -- I AM able to keep my 40k pool CRYSTAL clear water clean on the REAL. I also have to vacuum the bottom x1 every 2 or 3 wks BUT I NOW NEVER RUN MY POOLS PUMP only to vacuum. NO OTHER, ZERO testing or chasing %26 buying %26 getting suckered into BUYING every OTHER "pool cleaning" NIGHTMARE fix that never worked! TRY this method %26 see if YOU don't cut your POOL owning %26 seemingly constant water maintenance down to ZERO!!! Hope this helps ALL pool, pond, tub or water puddle owners end the 8 year NIGHTMARE I've had before developing this "easy as 1-2-3... A, b, c, baby you %26 me..." (sorry bout that, MJ flashback)

Helpful?1F1M4N2U6NUG5001911736
Nov 13, 2025
Cole
Item details
Size: 28 OZ
Multipack quantity: 1
5 out of 5 stars review

Verified Purchase

Works Like A Charm! Goodbye Algae!

The only thing I hate about this product is the price. Other than it costing so much, it works great. I have struggled with algae each summer since getting my pool and thins stuff clears it right up. After 1 bottle of this in the pool and some brushing, a couple days later my pool is crystal clear and looks amazing for at least a month. I know this says 3 months, but I obviously have some issues balancing my chemicals. I have had green and mustard algae and this has handled both with no problem. It takes the whole bottle, but this stuff WORKS! I have no doubt, if you have any amount of algae in your pool, this will resolve your issue. I will have to update my review next season when the algae comes back and I have to release this beast on it again.

Helpful?1F1M4N2U6NUG5001911736
Jun 29, 2025
Kathleen
Item details
Size: 28 OZ
Multipack quantity: 1
5 out of 5 stars review

Verified Purchase

Easy to use and Algae Free

I received this product free in exchange for my honest review. The day we were preparing to open our pool, I received HTH Pool Care Algae Guard Ultra. It arrived in an easy to open bottle with clear instructions and enough product for 2 doses. My pool walls did have a little green so after brushing and vacuuming the pool I followed the easy instructions on the bottle. The grandkids were going to be swimming that afternoon and it said it was safe after a short time. Yay! There were no harsh smells, it did not even for a second cause a cloudy film so I got in and so did the kids. We could not detect any difference in the water, it felt great! It's now 2 weeks later and no signs of algae so I would say it's very effective and I'm happy with the product. The cost is reasonable so I will always have some on hand. @influenster @hthpoolcare %23complimentary %23HTHPoolCare %23HTHPools %23AllClearWithHTH

Helpful?1F1M4N2U6NUG5001911736