Green streaks along the tank walls, a musty smell, or slimy residue clinging to internal surfaces are familiar sights for anyone managing a water tank. Algae growth, left unchecked, builds up fast and sticks around, especially during warmer months when sunlight and temperature combine to create ideal growing conditions. Once it settles in, it becomes more than just an unsightly problem.

Stubborn algae does more than make your tank look dirty. It clogs filters, lowers water quality, and messes with the overall efficiency of the system. Some types of algae also change the taste and odour of the water, making it unsuitable for its intended use. If you’re dealing with a persistent algae problem, the key is understanding what causes it and how to approach it systematically for good results.

Why Algae Growth Happens

Algae thrives when three things come together: light, warmth, and nutrients. When water tanks are exposed to sunlight, especially clear or translucent ones, ultraviolet rays feed the growth process. Combine that with warmer air and water temperatures, and algae can start to multiply quickly.

Nutrients like nitrogen and phosphorous are another piece of the puzzle. These elements can enter water tanks through dust, debris, bird droppings, or organic matter that slips through vents or unsealed gaps. Once inside, it doesn’t take long for algae to take hold.

Environmental factors make a huge impact as well. Take these scenarios for example:

– Tanks under or near trees collect leaves and twigs, some of which wash into the tank.

– Farmlands nearby increase the risk of nutrient-rich run-off entering rainwater systems.

– Poorly sealed tanks allow more exposure to both light and airborne contaminants.

You’ll often notice algae problems cropping up during spring and early summer when temperatures climb across Australia. Warmth speeds up biological activity, so tanks need more frequent inspections during those times.

Methods To Remove Stubborn Algae

Once algae takes root, getting rid of it requires more than just a quick rinse. Here are the most reliable ways to handle it.

1. Manual Cleaning

This is usually step one. Physical removal helps clear visible algae build-up on walls and internal surfaces.

Here’s a basic process you can follow:

– Drain the tank completely. It’s safer and more effective to clean when empty.

– Use long-handled scrubbing brushes to reach all surfaces.

– For hard-to-clean areas, use sponges or non-abrasive pads.

– Rinse down walls and the tank base once scrubbing is done.

– Wear gloves, long sleeves, and a mask if working inside an enclosed space.

Manual cleaning is best for light to moderate build-up. If your tank has already developed algae deep in seams, corners, or cracks, you’ll need to go a step further.

2. Chemical Treatments

Chemical removal works when algae is widespread or returns shortly after cleaning.

Here are common chemical options:

– Chlorine-based treatments suited for water tanks

– Hydrogen peroxide for non-toxic sterilisation

– Specialised algaecides safe for drinking water tanks

Make sure the product fits the tank material and intended use of the water. Always follow label instructions and allow enough time for the product to do its job. Once it’s done, flush the tank thoroughly to clear out chemical residue before refilling.

Keep in mind, chemical treatments work better when paired with physical scrubbing. This way, remaining algae in hard-to-reach places gets treated properly.

3. Biological Treatments

When looking for a natural way to manage algae, biological options are growing in popularity.

This method introduces helpful bacteria that out-compete algae for nutrients. Over time, the algae becomes deprived and dies off naturally. It’s low-impact and good for tanks that support ecosystems or are sensitive to strong chemicals.

Here’s what to know:

Advantages:

– Safe for many tank materials

– Supports longer-term balance if used correctly

Drawbacks:

– Slower to take effect

– May need repeated applications

– Only suitable for some water-use types, especially if not certified for drinking water

If you’re not in a rush, biological methods can offer gradual improvement, especially in combination with other maintenance practices.

Preventing Algae Regrowth

Cleaning your tank is just the first step. Keeping it that way is where ongoing care comes in.

Low-effort routines can make a big difference. Here are dependable maintenance habits:

– Monthly: Check for green films, unpleasant smells, or cloudy water

– Every 6 months: Clean or replace filters, fittings, and screens

– Yearly: Fully drain and clean the tank, flush the system, and inspect all parts

Rainwater tanks particularly benefit from added attention. Leaves, organic matter, and airborne particles easily find their way in without extra filters or diverters. Cleaning roof gutters and downpipes also helps reduce contamination.

If you’re consistent with basic upkeep, algae has fewer chances to return.

Environmental Controls That Help

Outside conditions can be just as important as cleaning. A bit of planning in the tank’s setup helps cut off algae before it starts.

These changes can help reduce sunlight and nutrients:

– Use a solid tank cover to block out UV rays

– Install UV-resistant coverings for partially exposed tanks

– Add shade using nearby structures or screens

– Fit mesh on openings to keep bugs and debris out

– Clean catchment areas like roofs and gutters often

– Install first-flush diverters for rainwater to keep dirty run-off out

One customer placed a light-coloured plastic tank directly under the morning sun and kept having trouble with algae, no matter how often they cleaned. After adding shading and changing the overflow setup to keep leaf debris out, algae growth dropped off completely.

Simple tweaks like that can turn things around long-term. Look at where your tank sits and how much exposure it gets. The goal is to block nutrients and sunlight wherever possible.

Why Professional Water Tank Cleaning Services Make a Difference

Handling algae on your own can be tough when tank design, size, or access points get in the way. This is where professional help makes all the difference.

Trained tank cleaners do more than scrub. They know how different tank materials react to products, how to spot signs of damage early, and how to handle confined spaces safely. Plus, they’ll bring in tools that reach spots general cleaning can miss.

Here’s what good service usually includes:

– Full internal and external clean

– Inspection for cracks, early corrosion, or damaged liners

– Drainage and refill support

– Sourcing safe treatment products for your specific setup

Check reviews before choosing any provider and confirm they have experience with your type of tank. Ask what services are included so there are no surprises later.

Working with water tanks isn’t just about cleaning. It’s about safety, water quality, and avoiding expensive repairs down the track.

Keeping Algae Away for Good

Algae doesn’t need much to grow. If your tank has light, warmth, and food sources like leaf litter or dust, it’s ready for algae season anytime.

Getting rid of it once is good. Making sure it doesn’t come back is even better.

Think long term: use covers, block UV, clean your inlets, and check the inside regularly. Take early signs seriously and don’t wait until problems build up.

An algae-free tank runs better, protects your water, and lasts longer. Stay one step ahead with regular care and the right cleaning support when needed.

For a truly clean and efficient water storage setup, trust the professionals. At ATM Tanks, we offer reliable water tank cleaning services that help keep your system clear of algae, residue and other build-up. Our team handles the tough jobs and catches early signs of trouble, so your tank can keep doing its job without surprises.