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Technical Library
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Technical Library

For more technical information from NPC and its members, click on the links below.

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Tech Bulletins

Pools technical library

Tech Bulletin 1 - Testing Fill Water
It has been a long held recommendation in the swimming pool industry to test the tap or fill water of a swimming pool (regardless of the interior finish) prior to filling a new pool. Additionally, the National Plasterers Council is stressing the need to test the fill water on any pool that has been drained for remodeling, renovation, or a simple repair prior to filling. Read more...

Tech Bulletin 2 - Hydration & Curing
The essential element in all good communications is that the parties involved must understand the vocabulary of the language used by one another in expressing their ideas and thoughts. If an idea or thought is expressed that holds two different interpretations, then communication will break down, be misunderstood, or at the very least be confusing and perplexing to all parties. In an attempt to prevent this miscommunication, the National Plasterers Council will address the often-misused terms of hydration and curing. Read more...

Tech Bulletin 3 - Swimming Pool Interior Finishes & Chemical Etching Deterioration
Swimming pool cementitious finishes are one of the most popular types of in-ground pool surface coatings because of the beauty and durability. There will be more noticeable cosmetic irregularities with smooth trowel finishes, as opposed to exposed aggregate finishes, as the surface interacts with its environment. In order to properly minimize all potential etching problems it takes a combination of good materials, application practices, good start-up procedures and a proper regimen of care and maintenance. Read more...

Tech Bulletin 4- The Most Common Reasons For Loss of Color
Pigments have been used in swimming pool cementitious finish coatings for many years. The diversity of available colors, together with a variety of finish options, allows for almost limitless possibilities of aesthetic variation to be achieved. However, maintaining the intended “look” of the finish, in terms of color and intensity, can be difficult. Read more...

Tech Bulletin 5 - PCA/NPC White Cement & Swimming Pool Plastering
White cement meeting ASTM C150, ASTM C595, or ASTM C1157 (“white cement”) is used in plaster, concrete, and masonry materials for a variety of architectural and decorative applications. White cement is specified in these applications for its color consistency, appearance and the ability to create a durable, rock-like material. Understanding the basics of cement chemistry and other factors that affect concrete color may help reduce some misconceptions about discoloration of cementitious materials. Color is an important quality control issue in the white cement industry in order to achieve consistency in brightness and tone. Read more...

Technical Information

White & Colored Pool Interior Finish Disclosure Document
Pool Interior Finishes are composed of materials which may have inherent shading and/or color variation which is normal and should not be construed as a defect. Read more...

Cal Poly Evaporation Study - Effectiveness of Pool Covers to Reduce Evaporation from Swimming Pools
Water is one of the earth’s most precious resources and is fundamental to quality of life, economic development, and the environment. However, drivers such as population growth, natural variability and change in climate, and urbanization are making water availability increasingly uncertain (Schnoor, 2008). In California, for example, the persistent and severe drought the state faced during the last four years has called for unprecedented measures including Executive Order from Governor Brown mandating 25 percent reduction in potable urban water use ( In response, cities and water management agencies across the state have enforced water conservation measures to meet the mandate. Read the complete report...

Torching: An Inexpensive Way to Eliminate Tough Pool Stains
When a plaster pool becomes severely discolored or stained, inexpensive remedies to fix the problem are limited, unless the pool professional is skilled in the process of torching. Torching can quickly remove a small water stain from plaster or a large discoloration that otherwise might require tearing out the pool surface and replacing it with a new one. Read the full article...

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