Rx Clear Mega Shock 73% Calcium Hypochlorite - Fast Algae Kill

In this review the Rx Clear Mega Shock 73% calcium hypochlorite is judged on how well it delivers a fast chlorine boost and clears algae for backyard pools. The bottom line: this one-pound granular shock is for pool owners who need a strong, multi-purpose treatment that sanitizes, clarifies, and works as an algicide. It shines when a quick, high-strength dose is required to break down organic matter and bring cloudy or green water back to clear, blue condition within hours when used as directed.

Key Features

• High chlorine strength: The 73% calcium hypochlorite formulation provides an extra-powerful chlorine boost ideal for rapid sanitizing and shock treatments.
• Multi-purpose action: It works as a sanitizer, clarifier, and algicide so you can address several water problems with a single product.
• Easy dosing guidance: One 1 lb bag per 10,000 gallons for maintenance makes it straightforward to measure and apply.
• Algae control: For stubborn green pools, the recommendation of 2 bags per 14,000 gallons gives a clear plan to beat the green and restore clarity.
• Night application advised: Instructions to add at night and wait 8 to 10 hours minimize loss from sunlight and maximize effectiveness.

Who It's For

Pool owners with aboveground or inground pools who need a potent shock that doubles as a clarifier and algaecide will appreciate this product. It is especially useful for seasonal openings, quick algae outbreaks, or when a fast raise of chlorine residuals is required.

Those who should look elsewhere include people with very small kiddie pools or users who prefer non-chlorine oxidizers; this is a high-strength calcium hypochlorite product intended for standard pool volumes and professional-strength treatment, not daily low-dose use in tiny pools.

Pros & Cons

Pros

• Very effective at restoring clarity and raising chlorine levels quickly according to multiple customer experiences.
• Multi-purpose formula that sanitizes, clarifies, and combats algae, reducing the need for separate chemicals.
• Granular form dissolves quickly when mixed and is easy to measure using the one-pound packets.

Cons

• Higher-strength chlorine can be overkill for routine maintenance and requires careful handling and accurate dosing.

Specifications

Product name	Rx Clear Mega Shock
Active ingredient	73% calcium hypochlorite
Package size	One pound bags
Pack configuration	Sold in 48 pack
Maintenance dose	1 lb per 10,000 gallons
Algae treatment dose	2 lbs per 14,000 gallons
Best use time	Apply at night; wait 8 to 10 hours before swimming

Our Verdict

Rx Clear Mega Shock is a strong, dependable option for pool owners who need rapid algae control and a quick chlorine boost. Its multi-purpose action and clear dosing instructions make it good value for seasonal cleanups and emergency treatments, though routine users may prefer gentler oxidizers for everyday maintenance.

Frequently Asked Questions

How much should I use for routine maintenance?
Use one 1 lb bag per 10,000 gallons as the recommended maintenance dose.

Can it clear a green pool quickly?
Yes; the formula is intended as an algaecide, and customers report cleared pools within hours when using the higher dose guidance.

When is the best time to add this shock?
For best results add at night and wait 8 to 10 hours before swimming to allow chlorine to work and dissipate.