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Total Dissolved Solids (TDS)

TDS is important in trouble-shooting the water quality of a pool or spa. The swimming pool and spa industry, as referenced in the (US) National Spa and Pool Institute Standards, defines TDS as “a measure of the total amount of dissolved matter in water, e.g. calcium, magnesium, carbonates, bicarbonates, metallic compounds, etc.”

High pool or spa TDS levels can result in hazy water, fixture corrosion, and scale build-up. High levels can also reduce the efficiency of other chemicals present. A high TDS level in spa water means that it is time to drain and refill the spa.

Reducing high TDS levels in pools commonly requires partially draining and adding fresh water. High TDS in a pool or spa when initially setting up might indicate poor water quality from corrosive mineral salts, humus, or organic matter. The pool and spa industry recommends consulting the local water authority if initial TDS is high. For proper swimming pool and spa maintenance, NSPI suggests the following operational guideline levels for TDS: 300 ppm - minimum, 1000-2000 ppm - ideal, 3000 ppm - maximum.

For more detailed advice on the specific chemical treatment for your pool or spa, contact your dealer.

• Aquachek® Professional Service Kit
• Aquachek® TDS