page loader

In most cases, our calcium treatment kit will remove calcium formation on fibreglass pool surfaces and restore the smooth blue finish within a few weeks.  Our treatments work to soften and dissolve the calcium formation without draining the pool water or scrubbing the pool.  Calcium formation on fibreglass will sometimes feel rough and gritty (like fine sandpaper) and often can get worse over time.

The white build-up on fibreglass pools is generally from one of the following causes:

1.   Calcium formation from high Calcium Hardness

One of the most common causes of calcium build-up in fibreglass pools is consistent high calcium hardness levels.   This sometimes happens because pool owners are advised to add calcium when their pool does not require calcium.  Pool water analysis software used by many pool shops to diagnose pool water is designed for concrete pools rather than fibreglass.  Concrete pools require a certain level of calcium chloride to be present in the pool, whereas fibreglass pools often do not.  Adding calcium will increase the calcium hardness of your pool water.  This can cause the calcium to precipitate onto the pool surfaces leaving a gritty white film on the fibreglass.  Many frustrated pool owners have told us that their calcium issues all started when they were told to add calcium to their fibreglass pool.

Calcium hardness can also be high if the wrong type of granular chlorine is used in your pool over a period of time.  Calcium hypochlorite is a common type of granular chlorine.  It uses calcium as the binding agent during manufacturing.  This means that when this type of granular chlorine is added to the water, calcium hypochlorite chlorite is added to the pool at the same time.  If your calcium hardness levels seem to be getting higher for no reason, then this may be the cause.

We also advise asking your fibreglass pool manufacturer about recommended calcium levels before adding any calcium based products to your pool.  In many cases, pool manufacturers do not recommend adding any calcium at all to their fibreglass pools!   Don’t worry, if you have calcium formation from high calcium hardness, then our treatments work to remove these for you very effectively in almost every case.

2.    Calcium formation from high pH

Should the pH of pool water increase and remain high for a long period of time, it will cause any calcium present in the water to precipitate onto the surfaces of the pool.  High pH will lead to the formation of a rough film or white build-up on the surface of your pool.  This calcium formation will become obvious when the pool is partially drained, or when the water level is low.  As the before and after pictures show, our treatments can remove calcium formation from fibreglass pools without draining the pool water or acid washing.

Calcium hardness can also be high if the wrong type of granular chlorine is used in your pool over a period of time.  Calcium hypochlorite is a common type of granular chlorine.  It uses calcium as the binding agent during manufacturing.  This means that when this type of granular chlorine is added to the water, calcium hypochlorite chlorite is added to the pool at the same time.  If your calcium hardness levels seem to be getting higher for no reason, then this may be the cause.

We also advise asking your fibreglass pool manufacturer about recommended calcium levels before adding any calcium based products to your pool.  In many cases, pool manufacturers do not recommend adding any calcium at all to their fibreglass pools!   Don’t worry, if you have calcium formation from high calcium hardness, then our treatments work to remove these for you very effectively in almost every case.

These pictures show calcium formation in a fibreglass pool which our treatment has removed without draining the pool water or acid washing.  Our customer in Western Australia was thrilled with the result.

Calcium on Fibreglass The Pool Stain Removers 3

The heavy calcium formation on this fibreglass pool almost completely obscures the smooth blue finish. This client has a calcium hardness level of over 1,000 PPM.  Our treatments were able to remove this calcium.

3.    Gelcoat reaction with the pool water

In some cases, a white formation can arise from a reaction between the gelcoat and the pool water. Gelcoat is the smooth blue interior of your fibreglass pool.  This reaction (like oxidisation) has little to do with the calcium or pH levels of your pool water.   In some circumstances, the Gelcoat will discolour and remain white if it has not been cured properly during manufacturing.  This reaction may become more pronounced if the pool water is very high in chlorine for an extended period.

The discolouration from this reaction is often very smooth to touch and is non-responsive to any type of cleaning method.  In some instances, wet & dry (or fine) sandpaper or a pumice stone can appear to remove this build-up.  However, we do not suggest rubbing the fibreglass surface with any type of abrasive.  This is because what will be removed is the contaminated Gelcoat – not the staining.  Rubbing back the surface of your pool will likely void your pool warranty, damage the pool surface and leave the pool more susceptible to future staining.

Our treatments can sometimes help with this issue but there are also some cases where nothing can reverse or remove the visual effects of this reaction.  Please contact us for further information if you feel your pool may have this issue.

It is important that you check your water regularly throughout the year, even in winter when your pool cover is on.  Many of our clients have only noticed this problem once they removed their pool cover after an extended period of time during winter.

Calcium on Fibreglass The Pool Stain Removers 4

Possible Gelcoat reaction with the pool water.  Notice the smoothness of the white film and the distinct separation between the vivid blue and white along the waterline.  Our treatments are sometimes effective with this issue.

Calcium on Fibreglass The Pool Stain Removers 5

This partially drained fibreglass pool shows the white calcium formation.  Notice how thick and widespread it has become along the walls. This client did not attempt any type of treatment hoping that it would just disappear over time.

Do Not Drain and Acid Wash Fibreglass Pools

We DO NOT recommend draining and acid washing fibreglass pools.  This is because the hydrostatic pressure from the surrounding soil can easily push the pool shell out of the ground.  In other cases, the pool sides can bend or buckle inward once the water is removed.  Should you decide to drain your fibreglass pool, we suggest using a licensed and insured professional to do this for you as the pool will need to be properly cross braced and secured before the water is released.  You may also need the contractor’s insurance to cover the cost of reinstallation, plumbing and excavation should the pool be pushed upward through hydrostatic ground pressure.

OPTION 1 – Calcium Removal DIY kit

What We Do 1

FREE DELIVERY

Calcium Stains in Swimming Pools The Pool Stain Removers 3

4 KGS POWDER COMPOUND

Calcium Stains in Swimming Pools The Pool Stain Removers 5

CALCIUM DISSOLVING LIQUID

INSTRUCTIONS


  • 1 Litre of our powerful calcium release and prevention formula
  • 4 Kgs of our granular calcium dissolving compounds custom made for your stain
  • Phone support from our technicians
  • Simple step-by-step instructions included
  • Pool does NOT need to be drained
  • Kit is sent and electronically tracked by Fastway Couriers
  • Kids are back in the pool in just 7 days
  • Kit is $275 for pools 45,000+ Litres

$235

Enquire now!

OPTION 2 – Calcium Removal – On Site Technician

TECHNICIAN VISIT

Calcium Stains in Swimming Pools The Pool Stain Removers 3

4 KGS POWDER COMPOUND

Calcium Stains in Swimming Pools The Pool Stain Removers 5

CALCIUM DISSOLVING LIQUID

WATER / EQUIPMENT TEST


  • 1 Litre of our powerful calcium release and prevention formula
  • 4 Kgs of our granular calcium dissolving compounds custom made for your stain
  • Pump, filter and chlorinator inspection
  • Surface inspection and stain diagnosis
  • Complete 7 point on site water testing
  • Your pool does NOT need to be drained
  • Kids are back in the pool in 7 days
  • Visit is $395 for pools 45,000+ Litres

$375

Enquire now!