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- Pool •
- Pool Care Education •
- Pool Maintenance •
When it’s time for your weekly pool shock treatment, you might wonder which product to use. Two of the most popular options are HTH™ Pool Care Liquid Chlorine and HTH™ Shock Advanced (powered by Cal Hypo). Let’s compare these choices to determine which is best for your pool and budget.
Shocking your pool is essential for maintaining clean and clear water. It eliminates harmful bacteria, algae, and contaminants left behind by swimmers, such as body oils, lotions, and sweat. Shocking also removes combined chlorine, which can cause eye irritation, skin discomfort, and unpleasant odors. For optimal water quality, we recommend shocking your pool with Cal Hypo weekly to solve 90% of common pool water problems, like cloudy water and algae growth.
How Do These Pool Shock Options Compare?
What Is Unstabilized Chlorine?
Both liquid chlorine and HTH™ Shock Advanced are unstabilized, meaning they do not contain cyanuric acid (CYA). While a small amount of CYA helps protect chlorine from being broken down by the sun, excessive CYA can lead to “chlorine lock,” preventing chlorine from effectively sanitizing your pool. Using an unstabilized chlorine shock for pools helps maintain proper chlorine balance without the risk of chlorine lock (also known as over-stabilization).
Liquid Pool Chlorine: Pros and Cons
At first glance, liquid pool chlorine seems like an appealing option. It acts quickly, contains no cyanuric acid, and doesn’t require dissolving. It also appears to be a low-cost shock treatment. However, there are several drawbacks to consider:
- Lower Strength: Majority of liquid chlorine contains only 10% available chlorine, making it the weakest shock option
- Short Shelf Life: It degrades over time, losing potency during storage and transport.
- Higher Usage: Because it’s weaker, you may need more product to achieve the desired chlorine levels, increasing costs.
- Storage and Handling Issues: Liquid chlorine is bulky, messy to handle, and requires careful transport.
- pH Imbalance: It has a very high pH, requiring frequent pH adjustments to maintain water balance.
- Environmental Impact: Sold in 1-gallon plastic containers, liquid chlorine contributes to plastic waste.
Want a deeper look? Read our guide: Liquid Chlorine in Pool vs. Shock.
HTH™ Shock Advanced: A Stronger Cal Hypo Pool Shock
HTH™ Shock Advanced is a granular cal hypo pool shock that is significantly more potent than liquid chlorine. It dissolves quickly, providing a fast-acting and effective chlorine shock for pools without the drawbacks of liquid chlorine.
- Higher Strength: It is more potent than liquid chlorine, offering better value over time.
- No CYA: No cyanuric acid means it prevents chlorine lock and extends chlorine effectiveness.
- Easy to Use: Pre-measured, single-use bags make storage and handling simple.
- Fast-Dissolving: Begins working immediately upon application.
- Lower Environmental Impact: Generates less plastic waste compared to liquid chlorine containers.
Which Pool Shock Treatment Is Right for Your Pool?
When comparing pool shock liquid chlorine and HTH™ Shock Advanced, like your pool water, the choice becomes clear. HTH™ Shock Advanced is significantly stronger, more stable during storage and transport, easier to handle, and more environmentally friendly. For a more effective and hassle-free pool shock treatment, HTH™ Shock Advanced is the superior option.
After shocking, test your water with HTH™ 6-Way Test Strips to confirm free available chlorine returns to 1–4 ppm before swimming. You’re all clear with HTH!
