I'm sure you have heard the term hard water thrown around by plumbers or even on television during the commercial breaks for your favorite shows. But have . Jun 20, 2017 - Balance refers to three component levels: pH, total alkalinity (TA) and hardness. If your chlorine level is too low, you add more chlorine. If your . Jump to Why is my calcium hardness too low? - The most common cause of low calcium hardness is the introduction of water that has fewer . Jan 9, 2017 - Well, most pools when it comes to chemistry want their calcium hardness to be between 200-400 ppm. That means that if you drain and refill your swimming pool with regular tap water, your water will be at the maximum levels in regards to calcium hardness. Calcium hardness is the measure of how hard or soft your pool water is, and measures the . Problems often associated with low calcium hardness include:. Award-Winning In Ground Pools, Spas, and Saunas Specializing in Sales, Service, . Pool water with low pH is also uncomfortable for swimmers, and chlorine will . You pool water's calcium hardness level should be maintained between . In simple terms, the pool owner should balance the pool's pH - its total alkalinity and the . Adding acid to lower pH will also LOWER Total Alkalinity. . This chemical raises Calcium Hardness levels, so more frequent testing may be necessary. Use a standard Shore A Durometer (0-100 hardness scale); 1Kg (2.2 lbs) of pressure; Measure the density . Predator Victory (Soft), 14mm, 75.3, Click for Price. Apr 11, 2016 - Award Winning Solutions . Let's learn a bit more about why rainwater can affect your pool water. . If enough rain falls into the pool, it can lower the pH levels. . a lowered pH, but also it contains other runoff elements that can change the calcium, hardness, alkalinity and total dissolved solids in your pool. Check your swimming pool regularly to make sure the water is safe for swimming. . filtration; chlorination; pH level; total alkalinity (TA); calcium hardness. Back to top . If the total alkalinity is too low, the pH balance can become unstable. Concrete and . Swimming Pool and Spa Association of Victoria Tel. (03) 9872 4502 .