Cleaning your pool
All pools require cleaning to remove the leaves , dirt and other grotty things that they collect. The kind of cleaner you need will depend on:
- the type of pool – in-ground or above-ground
- the size of your pool
- the amount and type of leaves it collects
- the filtration system and plumbing you have
- your budget.
The cheapest option is to do it yourself by 'hand vacuuming'. The 'vacuum' is attached to your skimmer box to create suction and then you manually push the vacuum around the surfaces of your pool with a pole. Typically, this will take between an hour and an hour and a half, and you'll need to do it once a week.
Without regular sanitisation, all pools develop bacteria – which can pose serious health risks. Water top-ups, leaves, grass, dust, and even people all cause bacteria to grow; these factors, along with the size of your pool, will determine the level of sanitisation you need.
Most pool owners use chlorine. There are other options to keep pool water clean and in balance – such as using ozone gas, UV sterilisation, bromine or ionization – but these methods make up a very small part of the Australian market. Health departments around Australia generally recommend all domestic pool owners have a chlorine residual in their pool.
There are three main ways domestic users can keep their pool chlorinated:
- By hand, which involves adding chlorine manually.
- By installing a salt chlorinator, which produces chlorine and is the most common form of domestic pool chlorination in Australia.
- By installing a liquid chemical feeder, which automatically adds chlorine.
As well as sanitisation, you also need to chemically balance your pool water. The chemical balance of your pool is made up of:
- pH (acidity/alkalinity level): 68%
- total alkalinity (TA): 16%
- calcium hardness: 16%
You should monitor your chlorine and pH levels at least once a week, or every day if your pool is in high use. Total alkalinity and calcium hardness levels can be monitored less frequently.
Maintaining the pH level of your pool is crucial to ensuring it's safe to use. Incorrect pH levels can cause itchy skin and red eyes, and can also reduce the effectiveness of chlorine.
pH ranges from 0 to 14, with 7.0 being neutral, anything above 7.0 alkaline, and anything below 7.0 acidic. The Australian Standard for pool water is 7.0 to 7.8, with 7.4 being ideal.
Rain, water top-ups, people swimming and chlorine will all also alter your pool's pH. You can raise pH levels by adding soda ash (which is alkaline) or lower them by adding pool acid.
Total alkalinity (TA)
Low levels of total alkalinity will cause erosion to pool surfaces and corrosion of equipment. It can also cause pH levels to become very unstable.
The Australian Standard recommends that your TA level should be 60 to 200 parts per million. You can raise the TA level by adding 'buffer' – sodium bicarbonate – or lower it by adding pool acid. Bear in mind, adding acid will also affect your pH levels.
Low levels of dissolved calcium in pool water can corrode pool equipment, and high levels can create scale. Calcium hardness levels can't be monitored using most domestic pool water-testing kits. Instead you need to take a sample of your pool water to your local pool shop for testing. In areas where calcium levels aren't high, you shouldn't need to do this test more than once a year – unless you use calcium hypochlorite to sanitise your pool.
There's a wide range of kits on the market you can use to test your pool water. A basic 'four-in-one' test is a good starting point. This kit tests chlorine levels, total alkalinity and pH, as well as the level of acid needed to rebalance the pH. Alternatively, you can now buy electronic testers, which will analyse a disposable strip that you dip in your pool. These strip readers tend to cost more.
The most labour-intensive way of keeping your pool sanitised is to manually add chlorine. This involves testing your pool's water to figure out how much chlorine to use, and will need to be done every second day for the average backyard pool. This might be the best option if you're renting a property with a pool and aren't looking for a long-term solution.
Saltwater pools are popular in Australian backyards – but they don't do away with the need for chlorine. Saltwater pools use salt chlorinators to convert common salt crystals into chlorine gas which is soluble in water.
- You can install a salt chlorinator in the existing pipe work of any pool. The only exception is above-ground pools with metal structures as they'll rust.
- Some salt chlorinators are self-cleaning. If you don't buy a self-cleaning model, you will need to manually clean the salt from the cell as often as every fortnight. Self-cleaning models don't need such intensive maintenance, but they are more expensive.
- When a salt chlorinator is initially installed, you will need to manually add salt to your pool. The recommended initial dose is 4kg of salt per 1000 litres – about 20–30% will be lost every year due to backwashing, splashing and overflow, so regular salt top-ups will be needed.
- Salt chlorinators operate automatically, so you can go on holiday knowing your pool water will remain clean. They are also cost-effective to run and will generally last about five years.
- The capacity of a chlorinator is usually expressed in grams per hour. Some pool suppliers will express a unit's capacity in terms of its liquid, granular or tablet chlorine equivalent. As a guide, liquid chlorine is about 12–15% chlorine, granular chlorine is about 65% chlorine and tablets can be up to 100% chlorine.
In cooler climates, heating your pool can give you the opportunity to swim all year round. The best heating choice for you will depend on where you live, your budget, and how you use your pool. An ideal water temperature is said to be around 25°C.
No matter how you heat your pool, a solar/thermal blanket is an excellent way to reduce heat loss overnight. These blankets not only keep the heat in, they also reduce evaporation. For this reason, some state governments offer rebates if you buy one — so find out what's on offer where you live.
If you live in an area with a lot of sun and you have a large roof area, solar heating is an efficient option. Solar heating works by pumping pool water into rubber matting that is installed on your roof. The matting is hot from the sun, and transfers the heat to the water before it returns to the pool.
Artical by Matthew Steen
- In order to be effective the rubber matting should be equal to at least 80% of the surface area of your pool. Ideally the matting should be installed on north- or west-facing roofs.
- While solar heating is the most energy efficient, a cloudy day could leave your pool too cool for a dip. But in warmer, sunnier climates it's realistic for a solar system to heat the water to 17–20 degrees, 10 months a year.
- A solar controller allows you to preset the water temperature you want.
- If you live in a tropical climate where your pool water becomes too warm to be refreshing, a solar heating system can be used to cool it down. The water is cooled by pumping it through your rubber matting at night.