Blackspot & Bubbles


Does your Fibreglass pool have Black Spots or Bubbles?

Perth Pool Co. is Western Australia’s leading professionals in ridding swimming pools of Black Spot Algae and Bubbles.

These two common pool problems can be difficult to remove and permanently fix without the proper treatment.

Algae is a diverse and resilient organism that thrives in water. Out of all the Algae species, Black Spot can be the most difficult and resistant to remove from a swimming pool.

Bubbles, commonly known as Osmosis are pockets of moisture within the layers of the Fibreglass. They generally appear when a pool has been constructed poorly and/or low quality products have been used, neglect of regular maintenance is also a significant factor.

Algae & Black Spots

Algae is a tough, simple form of plant matter that thrives in water environments. There are many types of Algae but Black Spot Algae is the most difficult to remove.

Black Spot spores may always be present in your pool, but when given the right conditions they will attach and embed themselves into pool walls and floors or areas where bubbles have broken and allowed the spores to attach.

From there they will actively bloom and multiply.

The visible black spot is the protective outer layer of the organism, this can be removed but will usually regenerate within a few days.

Resin Minerals

Once the fibreglass has fully cured, a Vinyl Ester Fill Coat is applied.

To ensure any small holes or imperfections possibly left after the fibreglass layer is removed, Fill Coat must be applied correctly.

Not only will this create a smooth surface but also a secondary chemical barrier.

The chosen colour pigment is added to the final Vinyl Ester Fill Coat as this will enhance surface finish quality to the following coat.

Bubbles (Osmosis)

Bubbles or Osmosis tend to show up 10 -15 years after the pool’s construction, though they can show up sooner or later. There are a few contributing factors which cause Bubbles.

Firstly your pool may have been built using low grade Resins, these cheaper alternatives commonly start to break down earlier in a pool’s life due to the poor quality. This allows delamination or separation of the Fibreglass and Gel Coat layer, causing microscopic holes to penetrate the Gel Coat and create Bubbles or Blisters.

Secondly your pool may have been built without a protective barrier on its outer shell. Without this crucial barrier ground water is able to slowly penetrate the porous shell also creating Bubbles and Blisters.

Raw Fibreglass

The quality of Resins and Gel Coats used on Fibreglass swimming pools in previous years, do not compare to today’s technology.

Older pools which were built with older technologies were not equipped with a durable barrier, strong enough to provide resistance against the harsh Australian UV rays and pool chemical, acid levels.

These unforgiving elements will, over time, break down the Gel Coat causing it to become chalky and eventually wear so thin that the raw Fibreglass shell becomes exposed

Trust Perth Pool Co. to resurface your pool today.