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CLOROX Pool&Spa 12204CLX Calcium Hardness Increaser, 4 lb

TLDR Review: Clorox Pool&Spa Calcium Hardness Increaser

By ShopSavvy Team

Published: June 9th, 2026

Pros

•Protects the vinyl pool liner effectively.
•Dissolves quickly for convenient use.
•Enhances water transparency, making the pool look clearer.
•Reduces algae blooms, helping to keep water cleaner.
•Offers great value for a necessary product, matching premium brands in effectiveness.
•Easy to apply with straightforward instructions.
•Comes with two internal packages, providing lonerm use.
•Suitable for frequent reordering and repeated applications.
•Transferred to a sturdy plastic container for better moisture protection and easier storage.
•Performs as well as more expensive alternatives.
•Larger volume per package compared to similar products, offering good value.

Cons

•Requires using a larger amount of product to achieve desired results.
•Slightly more product needed to get the job done effectively.
•Some users may find it takes more than expected to see results.
•No major negatives reported, but some might prefer a smaller or more concentrated pack.

Bottom Line

Based on common user feedback, the CLOROX Pool&Spa Calcium Hardness Increaser delivers reliable performance and good value, especially for maintaining water clarity and protecting pool liners. If you're looking for a quick-dissolving, cost-effective solution to raise calcium levels, this product is a solid choice. However, be prepared to use a slightly larger quantity to reach your desired hardness, making it ideal for users who don't mind a bit more product per application. For those seeking a more concentrated or smaller package, exploring related products might be worthwhile.

Lowest at Amazon

$9.53 at Amazon

How we researched this

About this review: We pulled together findings from professional reviews and hundreds of user reviews, and cross-referenced them with ShopSavvy's pricing data from 27 retailers to give you the short version.