A large metal box with a ladder on top, providing access to its interior. RavenTanks
GRP- A metal box with a ladder on top, providing access to its interior.

Water storage is a critical element of life in Australia, and choosing the right type of tank can make all the difference. Among the many options available, Glass Reinforced Plastic (GRP) tanks and Hot Dip Galvanized tanks stand out as popular choices.

What Are GRP Tanks and Hot Dip Galvanized Tanks?

What is a GRP Tank?

GRP, or Glass Reinforced Plastic, tanks are made from a composite material. They consist of layers of glass fiber and a plastic resin, typically polyester or epoxy. This composite material is molded into the desired tank shape, resulting in a lightweight yet durable tank.

What is a Hot Dip Galvanized Tank?

Hot Dip Galvanized tanks, on the other hand, are made from steel. They are immersed in a bath of molten zinc, which adheres to the steel, creating a protective layer against corrosion.

How Do These Tanks Compare in Terms of Durability?

Which Material Is More Resistant to Corrosion?

GRP tanks are highly resistant to corrosion, thanks to their composition. The plastic resin and glass fibers don’t corrode, making these tanks an ideal choice for areas with aggressive water or harsh environmental conditions.

Hot Dip Galvanized tanks offer some degree of corrosion resistance due to the zinc layer. However, this protection is not as effective as GRP, and over time, the zinc coating can deteriorate, leaving the underlying steel vulnerable to rust.

What About Impact Resistance?

GRP tanks are renowned for their high impact resistance. They can withstand significant physical stress without suffering damage, which is particularly important in areas prone to extreme weather conditions or accidental impacts.

Hot Dip Galvanized tanks, being made of steel, are more susceptible to denting and deformation upon impact. Even minor damage can compromise the tank’s structural integrity and lead to leaks or other issues.

How Do They Fare in Terms of Lifespan?

GRP tanks have a longer lifespan compared to Hot Dip Galvanized tanks. With proper maintenance, a GRP tank can last several decades. Their resistance to corrosion, impact, and UV degradation ensures a prolonged service life.

Hot Dip Galvanized tanks, although durable, tend to have a shorter lifespan. The zinc coating is not as permanent as the composite material of GRP tanks, and corrosion can eventually take its toll.

Which Tank Is Easier to Install and Maintain?

Installation Ease and Flexibility

Installing a GRP tank is generally easier and quicker. Their lightweight nature simplifies transportation and on-site handling, reducing installation time and costs.

Hot Dip Galvanized tanks, being heavier and made of steel, require more labor and equipment for installation. The process can be more time-consuming and expensive.

Maintenance Requirements

GRP tanks are virtually maintenance-free. The corrosion-resistant properties of GRP eliminate the need for rust-prevention measures, and the smooth, non-porous surface discourages the growth of algae or other organic matter inside the tank.

Hot Dip Galvanized tanks require regular maintenance to prevent rust. This involves inspections, recoating with zinc, and sometimes even complete tank replacements when corrosion becomes severe. The ongoing maintenance costs can add up significantly over time.

Which Tank Offers Better Water Quality?

Does the Tank Material Affect Water Purity?

GRP tanks have a significant advantage when it comes to water quality. The non-corrosive, non-reactive nature of the material ensures that the stored water remains pure and uncontaminated.

Hot Dip Galvanized tanks, while providing safe water storage, can introduce impurities if the zinc coating deteriorates. Corrosion products or zinc leaching into the water can affect its quality.

How Do They Prevent Algae Growth?

GRP tanks are designed with a smooth, non-porous inner surface that discourages the growth of algae. This helps maintain water quality and reduces the need for chemical treatments.

Hot Dip Galvanized tanks, with their steel surfaces, may develop rough spots over time, which can promote algae growth. This can necessitate the use of chemicals to control algae, potentially affecting water quality.

Which Tank Is More Environmentally Friendly?

How Do They Compare in Terms of Environmental Impact?

GRP tanks are eco-friendly due to their longer lifespan and minimal maintenance requirements. They reduce the need for resources used in the manufacturing and maintenance of tanks.

Hot Dip Galvanized tanks, while recyclable, require more frequent replacements and maintenance. This can result in a higher environmental footprint over time.

Do They Use Harmful Chemicals?

GRP tanks are free from harmful chemicals, ensuring that stored water remains pure and safe for consumption.

Hot Dip Galvanized tanks can introduce zinc into the water, which, in excess, can have adverse health effects. While zinc is not necessarily harmful at low levels, it is still a consideration for those concerned about water quality.

What About Cost and Value for Money?

Upfront Costs

GRP tanks are often more affordable upfront, making them a cost-effective choice for those with budget constraints.

Hot Dip Galvanized tanks tend to have higher initial costs due to the steel material and the galvanization process.

Long-Term Costs

GRP tanks offer better value for money over the long term. Their durability and low maintenance requirements result in lower overall costs.

Hot Dip Galvanized tanks, while initially more expensive, can become costlier in the long run due to maintenance and potential early replacements.

Uses of GRP Tanks

The use of GRP Tanks has a wide range of applications. Popular applications include rainwater storage, which allows both homeowners and businesses to become more environmentally friendly and reduce wastewater; dipping tanks for manufacturers to coat their goods; and fire sprinkler reservoirs, which ensure a continuous supply of water in the event of a commercial building fire. Furthermore, the materials used allow them to be adapted and manufactured at a specialized level to be used to store chemicals in a safe and controlled workplace environment.

Looking for the Best Team to Install and Maintain GRP Tanks?

Raven Tanks maintained water tanks all over Sydney, Melbourne, Brisbane, Canberra, Dalby, Darwin, and Geelong and needed a material that could withstand highly aggressive weather (cold/hot) in comparison to Steel, which has low corrosion resistance properties due to oxidation and corrosion, requiring painting or galvanizing. Aluminium tanks corrode as well, necessitating anodizing or other coatings. GRP is also resistant to chemical, wastewater, and sewage corrosion.

Our team of experts has extensive experience in providing top-quality storage solutions for a wide range of applications. We understand that the choice between GRP tanks and hot dip galvanized tanks can be a critical one. That’s why we’re here to help you navigate the complexities and make an informed choice.

Contact Raven Tanks today at 1800 907 834 or reach out via email at [email protected].


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