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title: "Hygiene Tools & Calculators — TXDY Knowledge Center"
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Knowledge Center 

# Tools & Calculators

Free, practical tools that turn hygiene guidance into exact numbers you can act on.

1.  [Home](/)
2.  Knowledge Center 
3.  Tools 

-   [
    
    ## PPM Calculator
    
    Work out how many NaDCC tablets you need for a given water volume and target chlorine concentration, with the full dilution chart and usage guide.
    
    Open tool ](/tools/ppm-calculator)
-   [
    
    ## Surface Dilution Calculator
    
    Enter your product, purpose and surface area to get the exact number of tablets and litres of water to prepare, in complete batches.
    
    Open tool ](/tools/surface-dilution-calculator)

![TXDY](/__l5e/assets-v1/efff7eda-4c23-4f9f-acce-0df3ae238fa6/txdy-logo.png)

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## Contact Us

-   +60 18-268 6875
-   hello@onesupplies.com.my
-   Kuala Lumpur, Malaysia

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