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Upon testing her water, her alkalinity level was 40 parts per million. Acceptable is 80-120ppm. This low of an alkalinity means that the water was very acidic. Which means very corrosive. Today I saw first hand the importance of maintaining the chemistry of your swimming pool. Keeping your water balanced is imperative to protect your plaster and equipment. By balanced, I mean keeping the levels of chlorine, pH, and alkalinity, among others, within the acceptable range. A customer called and said her pool plaster didn’t look right and her pool cleaning service had assured her It is normal. Upon arriving I noticed the pool plaster discoloration. I have seen this before in pools that are 30 years old. Her pool is only 4 years old. Upon testing her water, her alkalinity level was 40 parts per million. Acceptable is 80-120ppm. This low of an alkalinity means that the water was very acidic. Which means very corrosive. She mentioned the issue started about six months ago—right when her pool service company changed ownership. In just six months of unbalanced water, the pool plaster had deteriorated so much that a full replastering is the only way to repair it. This damage occurred under the watch of a supposed “professional pool cleaner.” Upon arriving I noticed the color was missing in places in her plaster. This situation highlights why it’s essential to hire professional pool cleaners or a reputable pool cleaning service near you. If you're maintaining your pool yourself, make sure to stay diligent about keeping your pool chemistry in check to avoid costly damage.