HTH Green to Blue Pool Shock Kit — Granules (Form), 4 lb — Pool Shock Treatment for Algae Removal and Water Clarification
HTH Green to Blue Pool Shock Kit — Granules (Form), 4 lb — Pool Shock Treatment for Algae Removal and Water Clarification
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HTH Green to Blue Pool Shock Kit — Granules (Form), 4 lb — Pool Shock Treatment for Algae Removal and Water Clarification

4.2 stars out of 1743 reviews
(4.2)|
1,743 ratings
HTH Green to Blue Pool Shock Kit — Granules (Form), 4 lb — Pool Shock Treatment for Algae Removal and Water ClarificationHTH Pool Care Green to Blue Advanced Shock System for Swimming Pools Granules 1 Kit
Count Per Pack:1

Key item features

  • Rapid Algae Elimination: This 2-step system effectively fights severe algae bloom, transforming green pool water to blue within 24 hours.
  • Dual-Action Treatment: Includes four bags of Pack I, a strong Cal Hypo shock for algae, and two bags of Pack II, a powerful flocculant for particle binding.
  • Flocculant Appearance: Pack II, the flocculant, has a normal brownish-orangish appearance.
  • Specific Compatibility: Not suitable for cartridge filters; requires a multi-port valve with a waste position for effective use.
  • Broad Pool Suitability: Compatible with all pool types that can vacuum to waste, including vinyl-lined pools, without causing liner fading.
  • Cyanuric Acid-Free: The Cal Hypo formula avoids adding cyanuric acid, preventing over-stabilization or chlorine lock.
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Current price is $28.44
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Customer ratings & reviews

4.2 out of 5 stars
stars1,743 ratings699 reviews
How item rating is calculated
  1. 5 stars73% (1,265)
  2. 4 stars6% (106)
  3. 3 stars4% (74)
  4. 2 stars3% (61)
  5. 1 star14% (237)

Reviews summary

Pros
  • : Makes pool preparation easy and efficient.
  • : Effectively removes algae overnight for easy vacuuming.
  • : Made with materials that are sturdy and reliable.
  • : Product includes easy-to-follow directions.
  • : Pricing is comparable to other sites and stores.
Neutral
  • : Can effectively control algae growth, but may leave residue.
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Showing 1-3 of 699 reviews

Aug 2, 2025
Wowowowow
Item details
Count per pack: 1
5 out of 5 stars review

Verified Purchase

Works great!!!

I can not believe this doesn't have a higher rating. It works AMAZINGLY!! I have to believe that if it doesn't work the way it should, it must be user error. I have used this a few times over the past few years %26 every time it does what it's supposed to. My pool was green %26 cloudy. My chlorine level and Ph level were both spot on, but i couldn't get rid of the green haze, even after adding algaecide w/ a clarifier, so I ordered this. After turning the pump off for about an hour, everything was in the middle of the pool. I vacuumed with the pool set to waste %26 it's already 98% clearer. Just need to vacuum on waste one more time %26 it'll be perfect. I didn't get a before photo, but i did get one of it all settled to the middle. It is so worth it if you can't get rid of the green. Oh, and my chlorine and Ph are still spot on after using this product. It doesn't "eat" the chlorine like algaecide does.

Helpful?0ZIE5OAS9L7A876392878
May 20, 2023
Donn
Top Reviewer
Item details
Count per pack: 1
5 out of 5 stars review

Verified Purchase

Review time! 😊 HTH Green to Blue for pools. First off, this is NOT a picture of my pool (I forgot to take one) BUT!!! My pool was darker than this and it looks like the second picture now except I have to vacuum the dead stuff up off the bottom. The directions say to put it in the skimmer but that wasn't an option since I have an Intex Coleman pool so I YouTubed it and the person using it just walked around the pool sprinkling it in. That seemed simple enough so that's what I did 😁 Went out this morning and it's crystal clear minus the dead stuff on the bottom that I'll vacuum up. I want to also say it should be called green to clear because your water doesn't turn blue...its clear. So....if you have a nasty green pool like I did, I highly recommend this product. 5 out of 5 Stars from me 👍

Helpful?0ZIE5OAS9L7A876392878
reply from HTH Pools Team

Donn, thank you for this awesome feedback.

Oct 18, 2025
Rebecca
Item details
Count per pack: 1
5 out of 5 stars review

Verified Purchase

This product is amazing but you MUST have a filter system than can vacuum to waste or be willing to siphon the settled particles off of the bottom and out of the pool. Works every time if you follow the directions

Helpful?0ZIE5OAS9L7A876392878