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A Tribute to Bob Lowry (October 1st 1946 to November 17th 2021)

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Added by shubnigg in Outdoors equipments


Bob Lowry passed away on November 17th, 2021 and a true legend has left the pool and spa industry. We recorded over 50 podcast episodes and he was a leader in the field of pool water chemistry.

Chapter Marks:
00:00 Intro
00:27 Last Video Call With Bob Lowry
04:16 What Bob Lowry means to the Industry
17:01 Bob Lowry on Bob Lowry
18:46 Final thoughts on Bob Lowry

He was the author of over 23 books but this has to be one of his most relevant and shortest books coming in at just 19 pages thick. But it is packed with so many essentials on residential pool chemistry that you will want a copy to carry in your service truck. Bob Lowry has been in the industry for over 49 years and is the Lead Consultant at Lowry Consulting Group, leads the Pool Chemistry Training Institute, and has created the Certified Residential Pool & Spa Certification Program. Learn more at

Here are all of the podcasts that I recorded with Bob Lowry:

Links to some of Bob Lowry’s books:

Pool Chemistry for Service Pros: For Residential Pools Only

Pool Chemistry for Residential Pools

Easy Pool Chemistry

Bob Lowry teaches Target Chemistry and here are his recommended target numbers. Not a range but a specific number to shoot for.

Sanitizer 3.0 ppm
After the alkalinity & pH are brought into range, the next adjustment is the sanitizer. Liquid Chlorine or Bleach is the most common and least expensive of the available sanitizers. The acceptable range is 1.5 - 3 ppm, though 4 - 5 ppm is absolutely fine. A commercial spa should be maintained at much higher levels - 5 - 6 ppm. Bob Lowry has the Target at 3.0 ppm so you should always aim for that for your residential pool.

A residential pool should be maintained at 3.0 ppm. The higher levels ( 4 - 5 ppm) should be established, prior to a large party or heat spell. Try not to allow the levels to drop below 3 ppm, as this will prevent the need to shock or take other corrective action after the party.

There are a number of factors that contribute to the "balance of the water." The most important is the pH and the alkalinity. The alkalinity is the ability of the water to buffer the pH (or buffer chemicals that may affect the pH). The alkalinity is like an auto-pilot or cruise-control for the pH.

If the alkalinity is out of the acceptable range, then any small factor will cause a wild swing in the pH. This is called "pH bounce." Because of this, alkalinity is the first thing that should be brought into line when balancing the water.

An ideal range for the alkalinity is 100-120 ppm (though 80 - 140 ppm is acceptable).

pH 7.5
The pH of the water determines if it is acidic or basic. Either extreme can have disastrous effects on the pool finish, equipment, or plumbing. When the pH is out of range, bathers may complain of eye discomfort or other ailments.

An acidic pH will cause the water to become aggressive. It will etch the plaster and cement finishes around the pool. Worse yet, it will dissolve the metallic components of the pool. The most expensive metallic component is the copper heat exchanger within the pool heater

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Shop at Leslie's: Leslie’s Pool Supplies has been do-it-yourselfers and pool trade professionals trusted partner since 1963, providing quality products and services to make pool care easy and solutions and expertise to do it right.

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