Rethinking Spa Chemistry! In l991 Jock Hamilton postulated the Hamilton Index system where total Alkalinity level be between 100 – 120 instead of 60 – 80. The pH to be between 7.6 and 8.2 instead of 7.4 – 7.6. The benefit of running a higher pH is less use of a sanitizer with a more stable pH. The Hamilton method has been used successfully for the last 12 years and is currently recommended by several Spa supply houses. EcoOne is a product line that has widened the pH between 7.2 – 8.2 leaving the Alkalinity at 100 – 120. With this system it is quite common to find that your pH rarely needs adjustment. Calcium levels should be maintained between 150 – 400 ppm and never filling the spa with water that has gone through a home water softener. Using 'ONEShockTM,'/Dichlor sanitizer is highly effective and dissipates at a fast rate, so you can add the minimal recommended amount after using your spa and its gone by morning. The use of 'ONEShockTM,' in this way ensures a clean bacteria free spa, with reduced exposure to chemicals during tub use. | 
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