09/12/2026
⚠️ THE DANGERS OF LOW pH AND ALKALINITY IN YOUR NORTH LAS VEGAS POOL
When most pool owners think about water chemistry, chlorine is usually the first thing that comes to mind. Chlorine is important, but it is only one part of keeping a swimming pool clean, comfortable, and protected.
Two other important readings are pH and total alkalinity. When either one remains too low, the water can become aggressive and begin damaging the pool surface, heater, pump components, metal fittings, and other equipment—even when the water looks perfectly clear.
WHAT IS pH?
pH measures how acidic or basic your pool water is. For most swimming pools, pH should generally remain between 7.2 and 7.8.
When pH falls below the recommended range, the water becomes increasingly acidic. Low-pH water does not always turn cloudy or green, so pool owners may not realize there is a problem. The water can look beautiful while corrosion and surface damage are developing behind the scenes.
WHAT IS TOTAL ALKALINITY?
Total alkalinity measures the water’s ability to resist sudden changes in pH. Think of alkalinity as the support system that helps keep pH stable.
A commonly recommended total alkalinity range is 80 to 120 parts per million, although the ideal target can vary depending on the pool, sanitizer, surface, and treatment program.
When alkalinity is too low, the pH can rise and fall quickly. This is commonly called “pH bounce.” You may adjust the pH and receive a good reading, only to discover that it has dropped again shortly afterward.
pH and total alkalinity are closely related, but they are not the same measurement. Both need to be tested and maintained.
HOW CAN LOW pH AND ALKALINITY DAMAGE YOUR POOL?
🔹 CORROSION OF POOL EQUIPMENT
Acidic water can attack metal components throughout the pool’s circulation and heating systems. This may include:
• Heater heat exchangers
• Pump seals and metal hardware
• Ladders and handrails
• Pool lights and metal niches
• Copper plumbing and fittings
• Saltwater chlorine-generator cells
• Internal equipment components
Pool heaters are especially vulnerable. When acidic water repeatedly passes through the heater, it can corrode the heat exchanger. This may eventually cause leaks, staining, poor heater performance, or complete equipment failure.
Replacing a heater or heat exchanger is far more expensive than maintaining the water properly.
🔹 DAMAGE TO PLASTER, PEBBLE, GROUT, AND OTHER SURFACES
Improperly balanced water can begin pulling minerals from cement-based pool surfaces. Over time, this may contribute to:
• Rough or etched plaster
• Pitting
• Discoloration
• Weakening grout
• Premature surface deterioration
• A shortened life for the interior finish
Once material has been etched away, adding chemicals cannot restore it. Correcting the chemistry may prevent additional damage, but the existing damage could require professional repair or refinishing.
North Las Vegas homeowners with plaster, quartz, or pebble-finish pools should pay close attention to complete water balance—not only chlorine.
🔹 STINGING EYES AND IRRITATED SKIN
Low-pH water can sting swimmers’ eyes, irritate their skin, and make the water feel harsh or uncomfortable.
However, swimmer discomfort should never be used as the only test of water quality. Eye irritation can also be caused by chloramines and other chemistry problems. The water needs to be properly tested instead of judged by its smell, appearance, or feel.
🔹 METAL STAINS AND DISCOLORED WATER
Corrosive water may dissolve copper, iron, and other metals from pool equipment or plumbing. Once those metals enter the water, they can cause stains on the pool finish or change the color of the water.
Blue-green staining may indicate copper. Brown or rust-colored staining can be related to iron.
Metal stains can be difficult and costly to remove. Preventing corrosion is much easier than trying to correct the damage afterward.
🔹 SHORTENED EQUIPMENT LIFE
A single low reading that is caught and corrected may not cause permanent damage. The greater danger is water that remains acidic or unstable for several days or weeks.
Repeated exposure can gradually damage seals, fittings, heaters, metal components, grout, and interior finishes. Unfortunately, the problem may remain unnoticed until equipment starts leaking, the heater stops working, or the pool surface becomes rough.
WHY DO pH AND ALKALINITY DROP?
Several conditions can cause low pH, low alkalinity, or both:
• Adding too much muriatic or dry acid
• Repeated use of acidic chlorine products
• Incorrect chemical dosing
• An inaccurate estimate of the pool’s volume
• Improper chemical-feeder settings
• Rainwater or storm runoff entering the pool
• Fresh water being added to the pool
• Inconsistent testing or neglected maintenance
North Las Vegas has a dry desert climate, but seasonal storms can still affect pool chemistry. More commonly, our intense heat causes significant evaporation and makes regular refilling necessary.
Evaporation leaves dissolved minerals behind, while replacement water introduces its own chemistry. This ongoing cycle can affect the pool’s overall water balance throughout the year.
Although our local water is known for containing minerals, that does not guarantee pH and alkalinity will remain high. Sanitizers, acid additions, dilution, feeder settings, and treatment methods can still push both readings too low.
WHAT ARE THE WARNING SIGNS?
Possible signs of low pH or alkalinity include:
• A pH reading below the recommended range
• Total alkalinity below the recommended range
• pH that changes significantly between service visits
• Stinging eyes or irritated skin
• Corrosion around metal components
• Rust or blue-green stains
• Rough, etched, or discolored plaster
• Unexplained deterioration of the heater or other equipment
Some pools will show no obvious warning signs. This is why dependable testing and consistent service are so important.
HOW SHOULD LOW pH AND ALKALINITY BE CORRECTED?
Never add pool chemicals based on a guess. Test the water first and confirm the approximate pool volume. The correct amount of product depends on the current reading, desired target, product strength, pool size, and the rest of the water chemistry.
When pH and alkalinity are both low, total alkalinity is commonly raised carefully with an alkalinity increaser such as sodium bicarbonate. The water should then circulate before it is retested. The pH can be adjusted afterward if necessary.
Soda ash may be used in certain situations to raise pH, but it can also increase alkalinity. Major corrections are often safer when divided into smaller treatments, allowing the water to circulate and be retested between additions.
Never mix pool chemicals. Always follow the product label and use proper protective equipment. Muriatic acid and chlorine must never be mixed because they can produce highly toxic gas.
If the pH is extremely low, the test result is uncertain, corrosion is visible, or the pool has specialized equipment, contact a qualified pool professional before attempting a major correction.
BALANCED WATER REQUIRES MORE THAN pH AND ALKALINITY
Proper pH and total alkalinity are essential, but they are only part of the complete picture. A thorough pool-water evaluation may also include:
• Free chlorine
• Combined chlorine
• Cyanuric acid or conditioner
• Calcium hardness
• Salt level, when applicable
• Water temperature
• Phosphates, when appropriate
• Overall saturation balance
These readings interact with one another. Aggressive or corrosive water cannot always be identified by looking at pH alone. Alkalinity, calcium hardness, stabilizer, temperature, and other factors also affect how the water reacts with the pool surface and equipment.
PROTECT YOUR NORTH LAS VEGAS POOL
A North Las Vegas pool should be tested consistently throughout the year, especially during heavy summer use, after major chemical additions, following a storm, or whenever the water or equipment changes.
Professional pool service should involve more than adding chlorine. It should include appropriate testing, chemical adjustments, circulation checks, and careful observation of the pool and its equipment.
Low pH and alkalinity can quietly cause expensive damage, even when the water looks crystal clear. Proper testing and timely corrections help protect swimmers, pool finishes, heaters, pumps, plumbing, metal components, and the overall life of your pool.
DPS Pool Solutions proudly provides professional pool care throughout North Las Vegas and the Las Vegas Valley. Our service is built around consistent care, detailed observation, and clear communication.
If your pool’s pH will not remain stable, the water feels uncomfortable, or you are concerned about corrosion or surface damage, contact DPS Pool Solutions for a professional evaluation.
🥷 DPS Pool Solutions
“Turning Green into Blue is Our Specialty.”