Solutions HOCL™ Cistern & Catchment Bomb™ Shock Treatment + Heavy-Duty Cleaner - 500g
Description
Description
Cistern & Catchment Shock Treatment & Heavy Duty Water Tank Cleaner – 500 g Value Size
Large or multiple water storage systems often face recurring buildup, slime formation, and persistent odors, requiring frequent and more cost-effective cleaning solutions.
The 500 g Value Size Shock Treatment delivers the same HOCL-based deep cleaning power as the 100 g version but is optimized for larger tanks and multi-system use. It provides a cost-efficient way to perform repeated shock treatments while maintaining performance. Using Natural Oxidation Technology™, it breaks down organic buildup, remove slime, and neutralize odor-causing residues—making it ideal for farms, large properties, and off-grid systems.
This size treats 25,000 gallons, offering approximately 2× more product per dollar compared to the 100 g size.
The Same HOCL Technology, Built for Larger Cisterns and Farm Water Tanks
This 500G value size uses the exact same HOCL-based formulation as our 100G Shock Treatment. NaDCC (sodium dichloroisocyanurate) dissolves in water to generate hypochlorous acid (HOCL), an oxidizing compound that breaks down the organic residues responsible for slime and odor buildup on cistern and catchment tank surfaces:
- Proteins from leaf litter, insects, and bird droppings entering rainwater catchment systems
- Fatty acids from environmental runoff and organic debris in stored water
- Amines from decaying organic matter accumulating in cistern and rainwater storage tanks
- Sulfur compounds from decomposing natural material causing unpleasant odors
After the oxidation reaction, the active ingredient converts primarily into salts and water, leaving no harsh bleach-based chemical residue in your large water storage tank. The 500G resealable pouch allows you to measure precisely the dose you need per treatment and store the remainder for your next scheduled cistern cleaning.
Ideal for These Large Cistern and Rainwater Storage Tank Applications
- Large residential and commercial cisterns, 5,000 to 25,000 gallons of rainwater storage capacity
- Farm water tanks and agricultural rainwater catchment systems needing cost-effective heavy-duty tank cleaning
- Multi-building off-grid and rural properties with interconnected cistern and catchment water storage systems
- Water storage systems that undergo periodic Shock Treatment cleaning followed by Monthly Maintenance & Light Cleaner upkeep
- Anyone looking for the best-value cistern shock treatment, at approximately 2.5× more product per dollar versus buying the 100G size multiple times
How to Use the 500G Value Size Cistern Shock Treatment
- Calculate total tank volume in gallons across all cisterns or rainwater storage tanks you plan to clean.
- Dose at 20 grams per 1,000 gallons of tank volume. Measure only the amount you need from the 500G resealable pouch and seal tightly after each use.
- Add the measured product directly into tank water or into inflow as the cistern fills.
- Allow at least 1 hour of contact time. For heavy organic buildup on large cistern surfaces, allow several hours until the water clears.
- Skim off any floating organic debris released from tank surfaces during the Shock Treatment.
- Follow up monthly with our Cistern & Catchment Monthly Maintenance & Light Cleaner to help slow organic buildup from returning between Shock Treatments.
Quick Dose Guide - 500G Value Size
|
Tank Volume |
Dose Required |
Portion of Pouch |
Notes |
|---|---|---|---|
|
5,000 gallons |
100 g |
1/5 of pouch |
Same as full 100G size |
|
10,000 gallons |
200 g |
2/5 of pouch |
Mid-size large cistern |
|
15,000 gallons |
300 g |
3/5 of pouch |
Large farm tank |
|
25,000 gallons |
500 g |
Full pouch |
Full single use of 500G value size |
Key Benefits
- Treats 25,000 gallons (20 g per 1,000 gallons)
- Same HOCL-based Natural Oxidation Technology™ formula
- Helps remove organic buildup, slime, and odors
- Ideal for large cisterns, farms, and multi-building systems
- Resealable pouch for multiple treatments
- Better cost efficiency (value size savings)
How It Works
The formula generates hypochlorous acid (HOCL) in water, which oxidizes organic contaminants and helps break down residues that cause odor, discoloration, and buildup—supporting a cleaner and more manageable system.
Important Note
This product is not NSF 60 Certified and not EPA registered.
It is offered as a cistern and catchment tank cleaner only.
Safety and Usage Information
Safety and Usage Information
Solutions HOCL™ Cistern & Catchment Bomb™ Shock Treatment + Hea...
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Made In
Heavy-Duty Cleaning for Cistern and Catchment Tanks
Shock-treat your cistern or catchment tank with HOCL-Based Natural Oxidation Technology™. Our granular formula is designed to help lift organic film, break down slime buildup, and neutralize odor-causing residues on tank surfaces making it easier to maintain cleaner tank over time.
Use as your initial deep clean, then follow with our Monthly Maintenance & Light Cleaner to help keep buildup from returning.
How HOCL-Based Natural Oxidation Technology™ Works on Organic Buildup
Organic compounds commonly found in tanks:
- Proteins (from leaf litter, insects, bird droppings)
- Fatty acids (from environmental runoff)
- Amines (from decaying organic matter)
- Sulfur compounds (from decomposing natural material)
What Happens If Not Neutralized:
When these organic compounds accumulate in stored water tanks, they can cause visible slime and biofilm on tank surfaces, unpleasant odors, and discoloration — making regular tank cleaning an important part of maintaining stored water systems.
Product Benefits:
- Helps break down organic film and slime buildup on tank surfaces and tank components
- Designed to reduce how often heavy-duty deep cleaning is needed when used with Monthly Maintenance & Light Cleaner
- Helps reduce odor-causing organic residues in cistern and catchment tank systems
4 Easy Steps to Clean Your Tank
1
DETERMINE YOUR TANK VOLUME
Calculate total gallons across the Cistern or Catchment tank(s) you plan to treat
2
MEASURE & ADD
Dose at 20 g per 1,000 gallons. Add directly into tank water or into inflow as the tank fills
3
ALLOW CONTACT TIME
Allow at least 1 hour; for heavier buildup, leave several hours until water clears. Skim off any floating debris released from surfaces
4
FOLLOW UP MONTHLY
Tank surfaces typically stay visibly cleaner for about a month. Then use our Monthly Maintenance & Light Cleaner between Shock Treatments
HOCL-Based Cleaning for Cisterns & Rainwater Catchment Systems
The SolutionsHOCL™ Cistern & Catchment Shock Treatment uses HOCL-Based Natural Oxidation Technology™. Hypochlorous acid (HOCL), generated from NaDCC (sodium dichloroisocyanurate), acts as an oxidizer that breaks down organic film, slime, proteins, fatty acids, and sulfur compounds that accumulate on tank surfaces and in stored water systems. After use, the active ingredient converts primarily into salts and water, reducing chemical residue in your system.
This product is not NSF 60 Certified and is not EPA registered. It is sold as a cistern and catchment water tank cleaner, not as an EPA-registered disinfectant or sanitizer.
Designed for Cistern and Catchment Tank Cleaning
Hypochlorous acid (HOCL) is widely studied for its properties as an oxidizing compound in cleaning and environmental surface applications. Our SolutionsHOCL™ formulas use HOCL chemistry — visit our Scientific Studies page to explore the published research on hypochlorous acid and its role in cleaning applications.
Why Tank Cleaners Love It
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No Scrubbing Needed
The granular formula does the heavy lifting on organic film and slime — simply measure, add, and allow contact time
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Designed for Ongoing Use
Pair with our Monthly Maintenance & Light Cleaner to help reduce buildup between Shock Treatments
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Tank-Compatible Formula
Suitable for use in most cistern and catchment tank materials, including plastic, concrete, and metal tanks. Not for aquatic systems
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Eco-Friendly Chemistry
The active ingredient converts primarily into salts and water after use — no harsh chemical residue left behind
SolutionsHOCL™ Cleaning Formulas
Our cleaning formulas feature Hypochlorous Acid (HOCL) as a key component. HOCL acts as an oxidizing compound that breaks down organic film, slime, and odor-causing residues through oxidation. Explore a curated selection of studies from reputable sources to enhance your understanding of HOCL's properties and effectiveness. Please note, these studies are for informational purposes only and explain how HOCL works in a range of cleaning applications. Visit our Scientific Studies page for references.
Our SolutionsHOCL™ products are formulated with eco-conscious ingredients. This product is in the process of being submitted for EPA review, although not yet complete. Please review our full line of Home Healthy™ Cleaning Products.
Frequently Asked Questions
Q: What is HOCL and How Does It Function as a Water Tank Cleaner?
Q: What is HOCL and How Does It Function as a Water Tank Cleaner?
Hypochlorous acid (HOCL) is an oxidizing compound generated when NaDCC (sodium dichloroisocyanurate) dissolves in water. As an oxidizer, HOCL breaks down organic matter — including proteins, fatty acids, amines, and sulfur compounds — that accumulate as slime and organic film on cistern and catchment tank surfaces. It is widely studied in cleaning and environmental surface applications. This product is not NSF 60 Certified and is not EPA registered; it is sold as a cistern and catchment tank cleaner only.
Q: What exactly is the Cistern & Catchment Shock Treatment?
Q: What exactly is the Cistern & Catchment Shock Treatment?
The Cistern & Catchment Shock Treatment is a heavy-duty granular tank cleaner designed for cistern and catchment water storage systems. It uses HOCL-Based Natural Oxidation Technology™ to help lift organic film, slime, and odor-causing residues from tank surfaces. The 100 g size treats up to 5,000 gallons; the 500 g value size treats up to 25,000 gallons at the same dose rate of 20 g per 1,000 gallons.
Q: Is this product safe for drinking water systems?
Q: Is this product safe for drinking water systems?
While we’re not certified by the EPA or FDA, this product is formulated with safe, food-grade ingredients commonly used in water treatment. It’s designed for systems where water is filtered and purified after storage. Always follow your local health guidelines and filtration processes if using water for consumption.
Q: How often should I use the Cistern & Catchment Shock Treatment?
Q: How often should I use the Cistern & Catchment Shock Treatment?
Use the Shock Treatment as needed for heavy-duty cleaning — typically when you notice significant slime buildup, odor, or discoloration in your tank. After your initial Shock Treatment, use our Monthly Maintenance & Light Cleaner once per month to help slow organic buildup from returning. Regular monthly maintenance reduces how often you need to shock treat.
Q: Will it damage my tank or plumbing system?
Q: Will it damage my tank or plumbing system?
The Shock Treatment is designed for use in cistern and catchment water tank systems, including plastic, concrete, and metal tanks. Do not use in ponds, aquariums, or any system with aquatic life — this product is toxic to aquatic organisms. Always follow dosing instructions and store separately from acids, ammonia, and other cleaning chemicals.
Q: Do I need to scrub or rinse my tank after use?
Q: Do I need to scrub or rinse my tank after use?
No scrubbing is required. Add the measured dose directly into your tank water or into inflow as the tank fills. Allow at least 1 hour of contact time (longer for heavier buildup). After treatment, skim off any floating debris that has been released from tank surfaces during treatment.
Q: Is it safe for the environment?
Q: Is it safe for the environment?
After reaction, the active ingredient converts primarily into salts and water, reducing chemical residue in your system. The formula is eco-friendly and septic-friendly. Do not dispose of large quantities into drains or waterways, and follow local regulations for product and container disposal.
Q: Will this help eliminate odors from my water?
Q: Will this help eliminate odors from my water?
The Shock Treatment is designed to break down odor-causing organic residues — including sulfur compounds, amines, and other organic matter — that accumulate on tank surfaces and contribute to unpleasant tank odors. After treatment, use our Monthly Maintenance & Light Cleaner monthly to help keep odor-causing buildup from returning between Shock Treatments.
Q: Does this product expire?
Q: Does this product expire?
Store in a cool, dry, well-ventilated place below 30°C (86°F), tightly closed and protected from moisture. When stored as directed, the product is typically suitable for extended storage. Check your packaging for best-by or lot information.
Q: How does SolutionsHOCL™ clean up your Cistern or Catchment Tank?
Q: How does SolutionsHOCL™ clean up your Cistern or Catchment Tank?
NaDCC dissolves in tank water and generates hypochlorous acid (HOCL), which acts as an oxidizer on organic film, slime, and residues on tank surfaces. The active compound breaks down proteins, fatty acids, amines, and sulfur compounds — the organic matter responsible for slime, cloudiness, and odor in stored water tanks. After the reaction, the active ingredient converts primarily into salts and water.
