Explanation:
Backwashing frequency for sand filters depends on the pressure difference between the influent and effluent gauges. When the pressure difference reaches 10 to 20 psi, it indicates that the filters are becoming clogged and need to be cleaned.
Explanation:
If the pump fails to prime, it is typically due to issues on the suction side of the pump, such as a leak, a loose or worn O-ring on the hair and lint strainer cover, or a clogged skimmer basket. High filter system pressure, however, is not directly related to priming issues and does not need to be checked in this context.
Explanation:
Chloramines are formed when chlorine combines with ammonia and other nitrogen-containing substances. High levels of chloramines can cause a strong chlorine odor and eye irritation, commonly referred to as “chlorine smell.” Therefore, the complaints of strong chlorine odor and eye irritation are likely due to high levels of chloramines in the pool water.
Explanation:
Opening and closing checklists help note unsafe conditions at a facility, should include a check of the main drain cover, and ensure proper deck clearance is maintained around the pool edge. These checklists are essential for maintaining safety and operational standards at a pool facility.
Explanation:
Sodium bicarbonate is commonly used to adjust total alkalinity levels in pool water. Total alkalinity acts as a buffer, helping to stabilize pH levels. If the tested total alkalinity is outside the acceptable range, adding sodium bicarbonate can help bring it back into the desired range, ensuring the pool water remains properly balanced and minimizing fluctuations in pH.
Explanation:
you need to add enough sodium hypochlorite to raise the free chlorine level from 1.5 ppm to the required 5 ppm. Based on the given options, 3.5 gallons is the closest estimate for the amount needed.
Explanation:
Oxidation Reduction Potential (ORP) testing is measured in millivolts (mV). ORP measures the ability of a chemical substance to oxidize or reduce another substance.
Explanation:
Safety and rescue equipment, such as lifebuoys, rescue poles, and first aid kits, should always be easily accessible around the pool area to ensure swift response in case of emergencies. Keeping them nearby maximizes their effectiveness in ensuring the safety of pool users.
Explanation:
Diatomaceous earth (DE) filter systems are known for their superior ability to remove the smallest micron particles from pool water. DE filters use a fine powder made from the fossilized remains of diatoms, microscopic algae, to trap particles as small as 2 to 5 microns, resulting in exceptionally clear water.
Explanation:
Channeling of filters occurs when the flow rate of water through the filter exceeds the filter’s maximum flow rate (FMR), causing water to cut channels through the filter media rather than being evenly distributed. This can lead to inefficient filtration and poor water quality.
Explanation:
Sodium carbonate, also known as soda ash, is commonly used to raise the pH level of pool water when it is too low. pH measures the acidity or alkalinity of the water, and maintaining it within the acceptable range is crucial for bather comfort and equipment protection. Adding sodium carbonate helps increase pH, ensuring the pool water is balanced and safe for swimming.
