One of the most absurd conclusions by the NPC/NPIRC study has to do with the causes of craze cracking (shrinkage cracks) in pool plaster.
It has been known for decades in the cement/concrete industry that high water to cement ratios, calcium chloride
Here's the guest blog I wrote for Jabariofwater.
When we When we visit our local pool, or a hotel pool when we travel, we have the expectation that the water is healthy and won’t make us or our family sick. We al
The NPC has stated that pool water must be maintained with a Langelier Saturation Index (LSI) between 0.0 and +0.3 for plaster pools (no negative LSI is allowed), and that disregarding those LSI parameters promotes white spotting, etching, and discol
When the NPIRC’s Phase 2 report is completely reviewed, it becomes obvious that the conclusions rendered are not supported by the results of their test pool experiments. It appears that the two Cal Poly professors and NPC leaders confused plaster sur
After their first year of study, the two Cal Poly professors wrote the NPIRC Phase 1 report, for the NPC, suggesting that aggressive water was the primary cause of “spot etching” in their plaster test pools… which of course, is what the NPC wanted.
Si
Years ago, pool service techs learned that aggressive water etches quality plaster surfaces uniformly - that it does not pick and choose some areas of the surface to etch, while leaving other areas untouched.
The cement/concrete industry documented th
The pool industry in North America is very seasonal, which means that most businesses hire seasonal staff on an annual basis. This can sometimes be trying, because we often work with high school students who may or may not have the work ethic that le
These porcelain panels are completely waterproof, frost proof, fade proof, pool chemical resistant, slip resistant, and very scratch resistant. Any image can be kiln-fired as the glaze and it will never fade. Panels are 1200mm x 2400 mm (~47.25" x 9
Blog by: Laurie Batter, originally posted on NSPF's blog at http://www.nspf.org/en/blog.aspx
It's 6am, the sun is just up, and I’m strapping on goggles and preparing for my daily lap swim. It’s a passion I have. People often remark, “Laurie, you are
When was the last time you thought to yourself - "Self, I wonder how my shoppers get to my store."?
Have you ever really stopped to think about it? I think most business owners would assume their customers are driving to their stores to do their shopp
Lakewood, NJ—The largest manufacturer of solar pool heaters in the United States has released a 6-minute behind-the-scenes look at its entire manufacturing process. The video takes viewers from “pellets to pallets,” with a step-by-step walkthrough of
In order to ensure a long-lasting and stain resistance finish, new quality pool plaster (including quartz and pebble) requires at least six to eight hours of proper curing (humidity) before filling with water, and requires the fill water to have a po
First of all, I would like to admit that it has been way too long since I have really participated here at the PGN and I am SORRY! I miss you all very much, but my focus has been laser targeted lately, and I simply haven't had the opportunity to join
The first picture shows white streaking on dark colored plaster caused by excessive and inappropriate water troweling, and the addition of calcium chloride to color pigmented plaster. In time, the color pigment is dissolved and lost from the plaster
A CPO and IPSSA member had contracted with a pool plasterer to re-plaster a swimming pool near Los Angeles. Within a week after plastering, the IPSSA member notified the plasterer that he could see some long cracks in several locations. The plaster
When a new white quartz pool in San Diego developed numerous shrinkage cracks and very rough and sharp calcium nodules everywhere, the plasterer drained the pool and sanded it, charging the pool owner one thousand dollars for the work. The crystallin
The following information provides pictures and scientific evidence from the cement petrographers who performed “failure analysis” examinations on white spotted pool plaster cores.
The first picture (above) is of a plaster core from the pool that had
