Maintaining Clean Water in Pools and Spas: Frequently Asked Questions

**1. The Importance of pH in Pool and Spa Water**

pH measures water acidity and alkalinity on a scale from 0 (acidic) to 14 (alkaline) with 7 as neutral. It is important to keep the pH at a balanced level between 7.2 and 7.8 since:

– **Sanitiser Effectiveness**: Chlorine, the primary sanitizer, works best within this range. Chlorine will not be able to eliminate bacteria and algae when the pH level is not within this range.
– **Bather Comfort**: It is not comfortable to have a pool with the pH levels not balanced as it can cause eye and skin irritation.
– **Equipment Longevity**: When the pH is high or low it can cause the metal parts in pool equipment to corrode.
– **Water Clarity**: If the pH levels are poor, the water may become cloudy and cause scaling, which will ruin the pool aesthetics.

**2. Total Alkalinity and Its Relationship to pH**

The total alkalinity shows how much the water can resist changes in pH levels and this is the pH buffer. The best range for pH should be 80-120 ppm because it helps to stabilize the pH and prevent rapid changes.

– **Low Alkalinity**: Results in the quick changes of the pH level and leads to corrosion and improper functioning of sanitizers.
– **High Alkalinity**: This makes it difficult to adjust the pH level and causes the formation of scales and the water becomes cloudy.

**3. The Role of Calcium Hardness**

The amount of dissolved calcium and magnesium in water is known as calcium hardness. There are many reasons why the right levels (200-400 ppm) are important for:

– **Preventing Corrosion**: Low levels of calcium in the water will cause the water to eat away the calcium on the pool surfaces which will cause damage to the pool.
– **Avoiding Scaling**: High levels of calcium in the water cause the formation of calcium deposits on the pool surfaces and equipment which hinders water flow and causes cloudiness.

**4. Total Dissolved Solids (TDS) and Water Quality**

TDS consists of all the substances that have dissolved in the water including minerals, salts and organic matter. The high TDS levels (above 1500 ppm) can pose some challenges such as:

– **Reduced Chlorine Efficiency**: Sanitizing power of chlorine in water is low when the TDS is high.
– **Salty Taste & Dull Appearance**: High TDS can cause the water to have a salty taste and it can also look dull.
– **Erratic Pool Chemistry**: High TDS makes it hard to balance the water chemistry, which in turn makes it hard to make adjustments to the chemical levels.

**5. Cyanuric Acid in Pool Sanitation**

Cyanuric acid is also known as a stabilizer and it helps to protect chlorine from the sun, thus keeping the chlorine levels steady.

– **Benefits**:
– **Reduced Chlorine Loss**: This is because it stops the chlorine from breaking down due to UV rays.
– **Stable Chlorine Levels**: This is because it helps in keeping the chlorine levels constant for the effectiveness of sanitizing.

**Recommended Level**: 30-50 ppm.

**6. Chloramines and Their Negative Impact**

Chloramines are formed when chlorine reacts with organic substances for instance, sweat or urine. They are undesirable due to:

– **Reduced Sanitation**: Chloramines are not as good at sanitizing as free chlorine.
– **Unpleasant Odour**: They are the ones that make the water smell like chlorine in the case of poorly maintained pools.
– **Eye & Skin Irritation**: Swimmers can get affected by this.

**7. The Importance of “Shocking” a Pool**

Superchlorination or shocking involves the addition of a large amount of chlorine to improve the water quality. It is usually done for the following reasons:

– **Eliminate Chloramines**: This is done to get rid of chloramines and bring back sanitizing.
– **Control Algae**: This is to get rid of the algae that is present in the water and to prevent future occurrence.
– **Clean Up After Heavy Use**: This is to get rid of the impurities that are left behind after a large number of people have used the pool.

**8. Types of Chlorine for Pool Use**

– **Chlorine Gas**: This is the cheapest but it has to be handled with care and special equipment.
– **Sodium Hypochlorite (Liquid Bleach)**: Easy to use but less concentrated.
– **Calcium Hypochlorite (Granules/Tablets)**: This is the most common type of chlorine for home pools and it is available in different forms.
– **Chlorinated Isocyanurates (Stabilised Chlorine)**: This is in the form of granules or tablets and contains cyanuric acid to increase the lifespan of chlorine.

The type of chlorine to be used should be determined by the size of the pool, the cost and the needs of the user. Consult a pool professional for advice on the best option for your setup.t.