Cal Hypo Pool Shock — Fast-Acting Calcium Hypochlorite Shock Treatment

Cal hypo pool shock is the industry-standard term for calcium hypochlorite granular applied in superchlorination — the process of rapidly raising free chlorine levels to eliminate contaminants, algae, and chloramines in swimming pool water. When pool service companies, commercial facility operators, and distributors need a dependable chlorine boost, cal hypo pool shock delivers the highest available chlorine content among solid chlorine shock products. Everglory Industrial manufactures and exports premium-grade cal hypo pool shock with 70% minimum available chlorine in granular form (8-30 mesh and 14-50 mesh), packed in UN 2880 certified drums for international shipping to 60+ countries worldwide.

What Is Cal Hypo Pool Shock?

"Cal hypo" is the universally recognized abbreviation for calcium hypochlorite — the chemical compound Ca(OCl)2. Cal hypo pool shock refers specifically to the granular calcium hypochlorite product applied at elevated doses to achieve breakpoint chlorination, a process that oxidizes combined chlorine (chloramines) and restores water clarity. Unlike stabilized chlorine products such as trichlor or dichlor, cal hypo pool shock contains no cyanuric acid stabilizer, which means the chlorine is fully active and immediately available upon dissolution. This unstabilized characteristic is precisely what makes cal hypo the preferred shock treatment chemical — it delivers an instant, concentrated chlorine dose without contributing to cyanuric acid buildup that can eventually lock chlorine and reduce its sanitizing effectiveness.

Why Choose Cal Hypo for Pool Shock Treatment?

B2B pool professionals select cal hypo pool shock over alternative shock products for several performance-driven reasons:

• Fastest chlorine release among solid shock types: Granular cal hypo dissolves within minutes, delivering an immediate chlorine spike. Lithium hypochlorite and potassium monopersulfate (MPS) are faster-acting alternatives but far more expensive per kilogram of available chlorine
• No cyanuric acid buildup: Unlike dichlor shock (which adds approximately 50% cyanuric acid by weight), cal hypo pool shock contributes zero stabilizer. This prevents the over-stabilization problem where cyanuric acid levels above 100 mg/L reduce chlorine effectiveness and require partial pool draining
• Highest available chlorine content: At 70% minimum available chlorine, cal hypo delivers more active sanitizer per kilogram than sodium hypochlorite liquid bleach (10-15%), lithium hypochlorite (35%), or dichlor (56-62%) — translating to lower product volume, less storage space, and reduced freight costs
• Calcium hardness contribution: Cal hypo adds approximately 0.7 mg/L calcium hardness per 10,000 L per 100g dose. In regions with naturally soft water, this is beneficial — it helps maintain the 200-400 mg/L calcium hardness range recommended for plaster pool surfaces
• Most cost-effective shock per kg of chlorine: When calculated on a cost-per-kilogram-of-available-chlorine basis, cal hypo pool shock consistently offers the lowest treatment cost among all solid chlorine shock products
• Two granular mesh sizes for different applications: 8-30 mesh granules dissolve slightly faster for immediate shock impact; 14-50 mesh provides a more uniform dissolution profile preferred by service companies for controlled dosing

Cal Hypo Pool Shock Specifications

Everglory Industrial produces cal hypo pool shock to stringent quality standards. Each production batch is laboratory-tested and accompanied by a Certificate of Analysis documenting the parameters below:

How to Apply Cal Hypo Pool Shock

Proper application of cal hypo pool shock ensures maximum effectiveness while protecting pool surfaces and equipment. B2B pool service operators should follow this standardized procedure:

• Test and balance water chemistry: Before shocking, verify pH is 7.2-7.6, total alkalinity 80-120 mg/L, and calcium hardness 200-400 mg/L. High pH reduces chlorine effectiveness — adjust pH downward before applying cal hypo pool shock
• Calculate dosage: For standard superchlorination, apply 500g of cal hypo per 50,000 L of pool water to raise free chlorine by approximately 5-7 mg/L. For algae treatment or severe contamination, double the dose to 1,000g per 50,000 L
• Pre-dissolve in a bucket: While cal hypo can be broadcast directly, pre-dissolving in a clean plastic bucket of pool water ensures even distribution and prevents granule sediment on the pool floor. Never add water to cal hypo — always add cal hypo to water
• Apply in the evening: Shocking at dusk prevents rapid UV degradation of the elevated chlorine residual. UV sunlight can destroy up to 90% of unstabilized free chlorine within 2 hours at midday — evening application allows the chlorine to work overnight
• Run the pump for 8 hours minimum: Circulate the shocked water through the filter system overnight to ensure complete distribution and contaminant oxidation. Do not swim until free chlorine drops below 5 mg/L
• Never mix with other chemicals: Cal hypo pool shock must never come into contact with acids, ammonia, trichlor tablets, or any other pool chemical. Cross-contamination can cause violent exothermic reactions and toxic gas release

Cal Hypo Pool Shock Dosage Guide

Use the following dosage reference chart for common pool volumes and treatment scenarios. All doses are based on 70% available chlorine cal hypo pool shock:

For commercial pools with heavy bather loads, apply cal hypo pool shock weekly during peak season. For residential pools, biweekly shock treatment is generally sufficient. Always test free chlorine levels before re-opening the pool to swimmers.

Cal Hypo Pool Shock vs Other Shock Types

B2B buyers evaluating shock treatment options should understand the comparative advantages of cal hypo pool shock against alternative products:

Packaging and Storage

All cal hypo pool shock is classified as UN 2880 (Class 5.1 Oxidizer) and requires certified dangerous goods packaging for international transport. Everglory Industrial packs every shipment exclusively in UN 2880 certified plastic drums with inner PE liners, ensuring full compliance with IMDG code for maritime shipping:

Store cal hypo pool shock in the original sealed drum in a cool, dry, well-ventilated area away from direct sunlight, heat sources, acids, ammonia, and combustible organic materials. Never store near trichlor or dichlor products. Do not stack drums more than three layers high. Under proper storage conditions, shelf life is 24 months from the manufacturing date. Reseal the drum tightly after each use to prevent moisture absorption, which can cause product degradation and chlorine loss.

Frequently Asked Questions