Case Study

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Welcome to our Case Study page. Here you will find examples of the supporting material we produce when undertaking your swimming pool maintenance. At Stargate we believe in transparency in all our undertakings. Detailed reports support all contracts including maintenance, repair and commissioning, meaning you have a point of reference at every stage of the process.

Your guide to a healthy, safe pool

Equipment and products needed for opening your pool
  • Water testing strips
  • pH increaser and decreaser
  • Total alkalinity increaser
  • Chlorine stabiliser
  • Calcium hardness increaser
  • Granular chlorine
  • Algacide
  • Scale, metal and stain control
  • Pool net
  • Brush
  • Vacuum
Pool opening timescale from complete refill
  • Run pumps for 24 hours
  • Start pool opening
Equipment and products needed for maintaining your pool 5 pool maintenance steps:
  • Balance
  • Chlorine
  • Water shock
  • Algaecide
  • Skim, brush & sweep
  • Water test strips
  • Chlorine tablets
  • Water shock
  • Alageside
  • Skimmer net
  • Pool brush
  • Vacuum
  • Scale, metal & stain control
  • Water clarifier
  • Chlorine floater
Pool terms The following are brief descriptions and treatment suggestions to keep your water elements balanced. pH determines the water’s acidity. Maintain pH for equipment and swimmer protection. If the pH is less than 7.2, use sodium hypochlorite to raise it. If the pH is higher than 7.6, use granular acid to lower it. Free available chlorine kills bacteria, algae and most viruses. It also eliminates grease and oil. If the free available chlorine is too low, add a shock treatment. A shock treatment is a high concentration of chlorine. Shocking adds 5.0 to 10.0 parts per million (PPM) of free available chlorine to pool water. Test and balance the pH before doing a shock treatment. Shock-treat after sundown with the pump and filter turned on. After a shock treatment, test the free available chlorine. Don’t enter the pool until the reading is 1.0 to 3.0 PPM. If it’s too high, allow the chlorine to evaporate naturally. Total alkalinity is the measurement of the water’s ability to maintain the proper pH level. If total alkalinity is too high or too low, use an alkalinity adjuster. Calcium hardness is a measurement of calcium in the pool. If the water is too hard, it can raise pH levels and cause scale to form. To solve this problem, add sodium hexametaphosphate. If the water is too soft, it can cause tile grout to dissolve or the vinyl liner to crack. Add calcium chloride dihydrate in this situation. Always follow manufacturer’s instructions when applying products. Pool chemical safety While pool chemicals are available to solve almost all water problems, they can be dangerous to humans and animals if handled improperly. Chemicals can cause skin and eye damage and can be fatal if swallowed. To keep yourself and your pool safe, follow these pool chemical safety precautions:
  • Keep all pool products away from children and animals
  • Wear rubber gloves and goggles, and wash clothes and hands immediately after handling chemicals. If your skin comes in contact with any chemicals, flush immediately with cold water for 15 minutes and call a physician
  • Follow the dosage directions and safety precautions listed on the pool product label
  • Store chemicals according to the manufacturer’s instructions
  • Never return spilled material to the original container or place in the household garbage
  • Use clean, dry measuring equipment for chemicals. Rinse all measuring equipment after using
  • Don’t mix spa, pool or household chemicals together
  • Add chemicals to water. Don’t add water to chemicals. Adding water to chemicals contaminates the entire container
  • Don’t allow dry chlorine to become damp or wet
  • Keep open flames away from pool chemicals
  • Don’t reuse empty containers. Check with local, state and federal regulations for proper disposal
  • Discard any unused chemicals after closing your pool. Follow local guidelines for disposing of hazardous materials. Buy new chemicals when you reopen the pool
General pool maintenance Clean water and balanced water chemistry are the keys to pool maintenance. Establish a weekly routine to clean the pool and maintain the chemical balance. A shock treatment solves and prevents the majority of pool problems. Test the pH and free available chlorine in the pool water and shock-treat, if necessary, on a weekly basis. Do an additional shock treatment if any of the following occurs:
  • Very heavy rains and windstorms
  • More swimmers than usual
  • Foul odor from the pool water
  • Extreme temperatures
  • Swimmers with burning, red eyes
  • Algae growth
  • Murky, slimy water
Keeping your pool clean Plan to spend at least six to eight hours per week on pool upkeep. Daily: 1. Skim debris out of the pool. 2. Clean all skimmer baskets during swimming season. Weekly: 1. Test the water. 2. Clean the walls and floor. Use cleaners, brushes and vacuums recommended by the pool manufacturer. Start at the shallow end and continue to the deep end. Overlap each stroke when vacuuming and brushing to cover all areas thoroughly. Always keep the vacuum head under water while in use. To speed up the process, dedicate 10 minutes a day to brushing down the walls. 3. Hose down the pool area after cleaning and before using. Direct the spray away from the pool to prevent dirt from washing into the water. Cleaning after a storm Summer sand storms can catch you off guard, but if you know a storm is approaching, cover the pool and anchor the sides of the cover with water bags or sandbags. If you have an automatic cleaner, turn it on. If you don’t have time to prepare, follow these steps to clean up: 1. Hose down the deck, spraying away from the pool. 2. Remove all debris from the water surface with the skimmer. 3. Turn on the pump. 4. Brush the walls and floor. Push the dirt toward the drain. 5. Vacuum the pool completely. 6. Wait 20 minutes and vacuum the pool again to get all remaining dirt. 7. Test the pH and adjust if necessary. Backwashing your pool filter When you start up your pool for the first time or at the beginning of the swimming season, you should have noted your clean reading on the pressure gauge. When the pressure gauge reading is 8 to 10 lbs. per square inch (psi) higher than the clean reading, you need to backwash the sand filter to remove the dirt particles and refresh the sand. If you don’t backwash the filter, the sand will not filter the tiny dirt particles out of the pool water.
  • Typical starting psi between 10 and 14
  • +8 to 10psi backwash until water in sight glass turns clear (3mins minimum – 5mins max)
  • Backwashing too often can stir up the sand and let small particles of debris pass through and filter back into the pool
  • Backwash water loss approx. 30 – 50 gallons @ 3 – 5 mins running
*Backwashing is not recommended as part of routine maintenance Your pool’s evaporation rate Swimming Pool area: 576 sq ft (16×36) Water Temperature 86 F Air Temperature 98 F Relative Humidity 50 % Evaporation when pool is unoccupied: 0.0241 I-b per hour per sq ft Total Evaporation: 0.0241×576 = 13.8 I-b/hour (1.66 US Gallon/hour) *Approx 1 cubic inch per week or 278 US Gallons or 1 wall tile **Mean deviation of 16.2% Source: ASHRAE Handbook, HVAC Applications1 Water loss update
  • Wed June 5 – Inlets and light fittings inspected and resealed
  • Thurs June 6 – Pool topped up with 500 gal
  • Thurs June 6 onward – pumps running only
  • Wed June 12 – baby pool inlets closed for final level testing
Wed June 12 – Water level marked down Image 1: Taken on Thursday 6 June – pm. You can see the water mark is 1 tile (or 0.5 inches) above the skimmer image002 Image 2: Image taken on Wed 12 June – baby pool inlets closed image001 Image 3: Image taken Wed 12 June – water level down 1 tile (0.5 inches) over 6 days. Related to the evaporation calculation above @ 1 inch per week, this is to be expected with mean deviation of 16.2% taken into account image003

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