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Orenda Calculator

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The essence of the Orenda Calculator is its ability to calculate the chemical dosing and Langelier Saturation Index (LSI) for pool water chemistry. It is designed to assist users in adjusting their pool water to desired chemical levels, providing specific dosing recommendations based on the pool’s current and desired water chemistry parameters.

Purpose and Functionality

The primary purpose of the Orenda Calculator is to guide pool owners and maintenance personnel in achieving the perfect balance of pool water chemistry. It does so by:

  1. Adjusting levels of Cyanuric Acid (CYA): Essential for stabilizing chlorine levels.
  2. Balancing Salt: Crucial for pools with salt chlorine generators.
  3. Regulating Chlorine: To ensure water is sanitized without being harsh on swimmers.
  4. Managing Enzymes and Other Chemicals: Like CV-600/700 and CE-Clarifier for clarity and cleanliness.
  5. Controlling Scale and Metal: With products like SC-1000, to prevent scale and corrosion.
  6. Removing Phosphates: Using PR-10,000 to reduce algae growth risk.

Additionally, it offers insights into carbonate alkalinity adjustments, highlights the importance of Total Dissolved Solids (TDS) including salt for LSI calculation, and explains the concept of pH ceiling.


The Orenda Calculator’s formula, in simple terms, can be described as a way to balance your pool water by making sure all the chemicals are at their ideal levels for a clean, safe swimming environment. Here’s a breakdown of its main components in straightforward language:

  1. Determine Your Pool’s Volume: Knowing how much water your pool holds is crucial because all the adjustments depend on this amount.
  2. Check Current Water Chemistry: Test your pool water to find out the current levels of key chemicals such as Cyanuric Acid (CYA), chlorine, and salt.
  3. Decide on Desired Levels: Based on guidelines or personal preference, decide what the ideal chemical levels should be for your pool.
  4. Calculate Adjustments: The calculator then figures out how much of each chemical you need to add or remove to get from the current levels to your desired levels.
  • Cyanuric Acid (CYA) helps protect chlorine from sunlight and should be kept at a certain level to ensure your chlorine remains effective.
  • Salt is needed for pools with saltwater systems. It needs to be at the right concentration for the system to produce chlorine efficiently.
  • Chlorine keeps the pool water sanitized, killing bacteria and algae.
  • Other Chemicals might include substances to clarify the water, control metal and scale formation, or remove phosphates that algae feed on.

The Orenda Calculator simplifies these adjustments by using the Langelier Saturation Index (LSI), which is a measure of water balance considering factors like pH, total alkalinity, calcium hardness, temperature, and the total dissolved solids (TDS) in the pool water. A balanced LSI means the water is neither too corrosive (which can damage the pool and equipment) nor too scaling (which can cause deposits to form on surfaces).

In essence, the Orenda Calculator helps you to:

  • Keep your pool water safe and pleasant for swimming.
  • Extend the lifespan of your pool and equipment by preventing corrosion and scaling.
  • Save time and money by providing precise dosing recommendations, so you only use as much chemical as you need.

Step-by-Step Example

Imagine you’ve tested your pool water and found the CYA levels to be lower than desired. Here’s how you’d use the Orenda Calculator:

  1. Input Pool Volume: Enter your pool’s volume in gallons.
  2. Adjust Current Levels: Set the dials to reflect your pool’s current CYA level.
  3. Set Desired Levels: Dial in your target CYA level.
  4. Calculate: Tap the calculate button to receive dosing recommendations.

Relevant Information Table

ParameterCurrent LevelDesired LevelAdjustment Needed
CYA30 ppm50 ppmIncrease by 20 ppm
Salt3200 ppm3400 ppmIncrease by 200 ppm
Chlorine1 ppm3 ppmIncrease by 2 ppm


The Orenda Calculator is more than just a tool; it’s a comprehensive guide for maintaining the health and balance of pool water. It stands out due to its precise formula for LSI and chemical doses, going beyond the basics covered by other calculators. By incorporating more variables closer to Dr. Langelier’s original saturation index, it ensures a more accurate assessment of water balance.

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