How much shock does my pool need?
This tool cannot diagnose that need. Once the supported label scope has been confirmed, it scales that product's range by water volume without selecting a point within it.
Pool Shock Calculator
Compare a label-based quantity range for one supported pool-shock product. This calculator does not decide whether your pool needs shock, select a dose or establish a universal target chlorine level.
Published by Pool Cost Planner. Updated October 19, 2026.
The result is a product-label planning range, not a diagnosis or a chosen treatment amount.
A shock calculator needs a product and a purpose
Shock describes a treatment purpose, not one interchangeable chemical. This tool supports the pool-shock range on the ProSide Granules 68% label, EPA registration 100368-6, for pools holding at least 10,000 US gallons. It is restricted to matching resealable containers. It does not cover smaller pools, spas, single-use bags, different products or other treatment purposes.
Methodology: a label range, not a universal target
The supported label range is 10-20 dry ounces per 10,000 US gallons. Each end is scaled by water volume and converted from mass ounces to pounds and kilograms. No midpoint is presented as a typical dose. No second concentration correction is applied because this range already refers to the formulated product. A label range still requires the actual package instructions and assessment of water conditions.
| Water volume | Lower end | Upper end |
|---|---|---|
| 10,000 US gal | 0.625 lb / about 0.283 kg | 1.25 lb / about 0.567 kg |
| 20,000 US gal | 1.25 lb / about 0.567 kg | 2.5 lb / about 1.134 kg |
| Below 10,000 US gal | Outside this model | No result |
Why there is no automatic shock target
Pool volume alone cannot establish chlorine demand or a successful treatment endpoint. A low free-chlorine reading, visible algae, combined chlorine and a contamination incident are not equivalent situations. This page does not diagnose those conditions or use a universal multiplier for combined chlorine. Confirm the applicable scope with the current label and a qualified provider before using a planning range.
Product mass is not a number of bags to add
Package sizes and package-use restrictions are separate from proportional arithmetic. This calculator excludes single-use bags and does not round the range to whole bags. Buying more product does not increase a treatment quantity. If the matching resealable package or its instructions cannot be confirmed, stop at the product-selection question instead of treating a similar brand as equivalent.
Chlorine increase versus shock planning
The chlorine calculator answers a different question: the theoretical mass for an entered free-chlorine increase using a specified available-chlorine fraction. This page instead displays a manufacturer's product range without choosing a target. Neither tool predicts actual chlorine consumption or proves that a treatment worked. Their outputs are not two quantities to add together.
Useful information for a service discussion
Bring the current water readings, test date, estimated water volume, exact product name, registration number and container type. Ask which label use applies and what the provider will verify. This makes the scope of advice clearer without turning a generic website result into an instruction. For recurring spending, use a separate supplies budget rather than multiplying this range by an assumed weekly schedule.
Sources and review scope
Sources checked October 19, 2026. Model-specific instructions are not universal guidance. No independent professional review is claimed.
- EPA: ProSide Granules 68%, registration 100368-6, label pages 1, 3-4. Accepted August 14, 2025; PDF pages 3, 5-6.
- Pyrock Chemical: ProSide Cal Hypo 68% product and registration. Publication date not stated; current package documents available from manufacturer.
- CDC: home pool water treatment and testing. Reviewed May 10, 2024.
Related calculators and guides
- Start with measured water dimensions: Pool Volume Calculator.
- Choose a supported water-planning tool: Pool Chemical Calculator.
- For a theoretical free-chlorine increment, not this label range: Pool Chlorine Calculator.
- Keep spending separate from treatment decisions: Pool Chemicals Cost Calculator.
- Organize testing and service records: Pool Maintenance Guide.
FAQ
Does it work for every shock brand?
No. A different formulation or package needs its own applicable model. Do not substitute products based only on a similar percentage.
Why are smaller pools and single-use bags excluded?
They are outside the scope verified for this range. The tool returns an error for an unsupported volume and requires confirmation of a matching resealable container.
Should I add this amount to the chlorine calculator result?
No. The tools represent separate planning questions. Adding their outputs would create an unsupported combined treatment.
Does the range say when swimming can resume?
No. Actual water tests and the applicable label determine the next decision; this planning tool does not certify safe water.