Low-Chlorine Systems and Concrete Pool Staining
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Q: “I’m considering installing a low-chlorine system that uses copper ionisation. I’ve heard these are great for reducing chemicals, but someone mentioned potential staining issues with concrete pools. Should I be concerned?”
A: The growing popularity of low-chlorine sanitisation systems has brought this important topic to the forefront of pool maintenance discussions. Systems like the Naked Pools Freshwater System, Bionizer, SwimFresh, Enviroswim, and ECOsmarte are indeed very good for reducing chemical usage and creating a gentler swimming environment, but they do require some extra attention when paired with concrete pools. Let me explain why and what you need to watch for.
Copper ionisation works by releasing tiny amounts of natural copper into your pool water to kill algae and bacteria, reducing the need for chlorine. It’s an effective and environmentally friendly approach that makes the water softer on your skin, eyes, and hair. However, if copper levels creep too high, there is a risk of staining on porous surfaces like concrete pool shells and plaster finishes.
The good news is that staining is preventable with proper monitoring. Copper levels will generally rise slowly in these systems as the release of copper ions into the water is gradual. The key is keeping the copper concentration in the friendly zone of 0.2-0.5ppm. If levels exceed this range, particularly above 1.0ppm, staining becomes a real risk and can be challenging to remove.
Here are our top tips for concrete pool owners using copper ionisation systems:
– Test copper levels at least monthly, but preferably more often during peak swimming season or after heavy rain/top-ups.
– If you notice copper levels creeping up, a quick temporary fix is to backwash your pool (effectively removing some water) and top up with fresh water. This helps dilute the copper concentration while you arrange for more specific advice from your system technician.
– Keep your pH balanced between 7.2-7.6. When pH falls outside this range, copper becomes less stable in solution and levels can rise more quickly, increasing the risk of staining.
The investment in regular testing is minimal compared to the potential cost and hassle of dealing with copper staining. Many pool owners simply add this quick check to their regular water testing routine for peace of mind.
Hopefully this helps explain why monitoring copper levels is so important with these systems. They’re excellent technology when managed correctly!
Oz
Rainbow Quartz
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The above content is of a general nature. Different pools offer different variables and Rainbow Quartz encourages you to seek the advice of your professional pool builder in relation to your specific circumstances. If you’re in the market for a new pool and would like Rainbow Quartz for the finish on your concrete pool, please reach out – we are happy to answer queries and can put you in contact with vetted pool builders in your area.