Calcium hardness

Raise your pool’s calcium hardness level quickly and efficiently. 10lb extra value size.

🚚 Free shipping on all orders πŸ‘ 100% lifetime money guarantee if you’re not satisfied with resultsπŸ“¦ Arrives in 2-4 days for orders within the domestic US

  • Boosts Hardness Fast: Elevates calcium levels to prevent corrosion, extending pool life.
  • Quick Dissolve: No fuss, no residue - just a cleaner, clearer pool in minutes.
  • Pool Surface Protector: Shields against etching and staining, keeping your pool looking new.
  • User-Friendly: Straightforward instructions for effortless pool maintenance.
  • Universal Compatibility: Works with all pool types, including chlorine and saltwater systems.
  • Trusted Quality: Made in the USA for reliable, consistent pool care.
  • 1lb of this product will raise calcium hardness by 10 ppm in a 10k gallon pool
  • If you need to increase by more than 10 ppm, multiply the dosage accordingly (e.g., to raise by 30 ppm in a 10K gallon pool, add 3lbs)
  • Broadcast (in plain English: sprinkle around widely) appropriate dosage directly into pool

Make your pool Squeaky Clean

Easy to use
Slick application methods make your DIY job a little easier
Clear video instructions
All our products have a QR code with short, easy to follow video instructions
Premium products
Simply put we source only the best, don't wonder about what's going in your pool
Save money
Customers using our products for DIY maintenance save 60% on average vs. hiring a technician
Let us help you, help your poolπŸ‘€
Let us help you, help your poolπŸ‘€
Let us help you, help your poolπŸ‘€
Let us help you, help your poolπŸ‘€
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Frequently Asked
Question

Simply put, we stand by our products! If you’re not happy with the results just reach out at returns@poolday.com within 60 days of your purchase and we will help you process a return and you will get a 100% refund.

Yes, we offer free shipping on all orders over $75!

Right now, we only ship to the continental USA. We are hoping to expand to additional countries soon!

Yes! Our current products will work with all types of pools including salt.

We want to make pool care easy. That’s why we provide a QR code with video instructions on all our packaging.