The 5 Most Important Pool Chemicals You Can’t Do Without

If you have a pool at your home, you’ll need a few chemicals to take care of it properly. You can’t just let your pool sit in the backyard for years and hope that it will be OK. It will eventually develop algae and other problems that make it unswimmable.

There are a few basic chemicals and tools you will need to ensure your pool is always safe to swim in.

Muriatic Acid / Sodium Bisulfate

Pool acid is one of the most important chemicals you can have for your pool. This chemical will help you lower your pool’s alkalinity to a more reasonable level.

Your pool’s pH level is also related to your pool’s alkalinity. You will probably have a high pH if your alkalinity tests high, but this problem can easily be resolved by using the Muriatic Acid or Sodium Bisulfate.


This is one of the reasons this chemical is so incredibly important for your pool – it can be used to correct multiple issues.

The amount of pool acid you use varies depending on the level of pH in your pool. For example, if your pool has 10,000 litres of water and a pH grade of 8.0, you’ll need to add 110 ml of pool acid.

Pour this solution into the deep end of your pool and let it sit for a few hours. You may want to dilute the solution in a bucket of water before you pour it in your pool water, just to avoid any potential chemical reactions.


Chlorine is probably the most important chemical you can have for your pool because it will prevent the ugly green slime from developing in your water.

Pool Chlorine 4kg

Chlorine eats away at the bacteria that cause algae to grow, which will make your water appear clean and clear.

You can usually get chlorine tablets that go in your pool once every few days or weeks, depending on how often you use it.

Our AOL Pool Shop staff can point you to the right chlorine strength based on how many litres are in your pool.

Calcium Hardness Problems

If your pool is cloudy and hard to see through, you have a calcium problem. You may have used too much Muriatic Acid when altering the pH, and this can cause an increase in calcium.

To combat this issue, you don’t really need a pool chemical to balance the situation. Simply add some fresh water to your pool. Get your garden hose and add a few hundred gallons, then test the water again later.


The sun will destroy chlorine particles unless they have some sort of insulation, which is usually a stabiliser.

Some chlorine tablets are blended with the stabiliser for a quick fix solution.

Total Dissolved Solids

The Total Dissolved Solids in your pool, or TDS, indicates how many dissolved minerals are in the water. If there are too many minerals in your water, your other chemicals will have a hard time doing their job.

You may need to drain some of your existing water and add fresh water from your hose to lower the TDS level.

A pool water testing kit can tell you exactly how many Total Dissolved Solids are in your pool water.



You don’t want your guests to be disgusted when they see the pool in your backyard, which is why these chemicals are necessary for a pool owner. Be sure to have these chemicals and testing kits readily available if you want your pool to look great all year round.

If you need to buy or top up your pool chemical supplies, check out our huge selection at the AOL Pool Shop today.

Don’t have the time or energy to worry about all these chemicals? Do you live in the Adelaide metro area?Book the AOL Pool Shop’s renowned pool servicing today and we’ll send one of our specialists out to do the heavy lifting for you!

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