Spirulina Fertilizer 200g. Premium pre-blended mineral blend for Spirulina Platensis culture. Replenishes nutrients after harvest. UK-based supplier.
£14.99
https://www.agrifarming.in/growing-spirulina
https://www.wikihow.com/Grow-Spirulina-at-Home
Spirulina Fertilizer is a specially formulated mineral blend designed to replenish the nutrients in your spirulina tank after harvesting. As your culture grows, it consumes the minerals in the water. This fertilizer restores them, keeping your culture healthy and productive.
This is a high-quality, pre-blended fertilizer made from six essential mineral salts. It is formulated specifically for Spirulina Platensis — not a generic plant fertilizer. Every ingredient serves a purpose in supporting healthy spirulina growth.
This Spirulina Fertilizer contains the following ingredients, pre-blended and ready to use:
Potassium nitrate — provides nitrogen, essential for protein synthesis and cell growth
Monoammonium phosphate — supplies phosphorus, which supports energy transfer within the cells
Iron sulfate — critical for photosynthesis and the deep green pigment that indicates healthy spirulina
Potassium sulfate — supports cell function and overall vitality of the culture
Magnesium sulfate — a key component of chlorophyll, the molecule that captures light
Calcium chloride — supports cell wall structure and stability
These six minerals work together to maintain the chemistry your spirulina needs to thrive. Nothing here is filler. Every ingredient is included because the culture requires it.
When to add: After harvesting spirulina from your tank.
Dosage: For every tablespoon of harvested spirulina, add 1 tablespoon of Spirulina Fertilizer.
How to mix: Dissolve the fertilizer fully in distilled water before adding it to the tank. This can take 12–24 hours. Agitation speeds up the process.
Important: Do not overfeed the culture. Adding more fertilizer than recommended will not make spirulina grow faster. It can alter the pH, increase salinity beyond the safe range, and harm the culture.
Harvest your spirulina using a fine mesh or cloth.
Measure the fertilizer — 1 tablespoon per tablespoon of harvested spirulina.
Dissolve in distilled water. Use enough water to fully dissolve the fertilizer. This takes 12–24 hours.
Check the pH — it should remain between 10 and 11.
Add the dissolved fertilizer to the tank.
Stir gently to distribute it through the culture.
Distilled water contains no chlorine or dissolved minerals that could interfere with the fertilizer. Tap water can be used if left to stand for 24 hours, but distilled water gives the most predictable result.
Spirulina Fertilizer is part of a complete growing routine. For best results, also maintain:
Temperature: 30–35°C for optimal growth.
pH: Between 10 and 11. Test regularly, especially after adding fertilizer.
Salinity: 15–20 PPT. A refractometer makes this easy to monitor.
Light: Natural daylight or a grow light. Avoid direct midday sun.
Agitation: Gentle movement keeps the culture circulating and prevents it from settling.
Q: What is Spirulina Fertilizer?
A: It is a pre-blended mineral fertilizer formulated specifically for Spirulina Platensis culture. It replenishes the nutrients your spirulina consumes as it grows.
Q: What’s in it?
A: Potassium nitrate, monoammonium phosphate, iron sulfate, potassium sulfate, magnesium sulfate, and calcium chloride.
Q: When do I add it?
A: After harvesting spirulina. It replaces the minerals removed with the harvest.
Q: How much do I use?
A: For every tablespoon of harvested spirulina, add 1 tablespoon of fertilizer.
Q: How do I mix it?
A: Dissolve it fully in distilled water before adding it to the tank. This takes 12–24 hours.
Q: Why does it take so long to dissolve?
A: The mineral salts need time to break down fully. Agitation speeds up the process. Adding undissolved fertilizer directly to the tank can harm the culture.
Q: Can I use tap water?
A: Distilled water is best. Tap water can be used if left to stand for 24 hours to allow chlorine to evaporate.
Q: Can I overfeed the culture?
A: Yes, and you should avoid it. Too much fertilizer can alter pH and salinity, which harms the spirulina. Follow the dosage exactly.
Q: What happens if I don’t add fertilizer?
A: Growth will slow, and the culture may turn pale or yellow. The minerals in the tank become depleted as spirulina consumes them.
Q: Is this the same as the nutrient medium?
A: No. The nutrient medium is used to prepare a new tank from scratch. This fertilizer is for maintaining an established tank after harvesting.
Q: How often should I add fertilizer?
A: Each time you harvest. If you harvest regularly, you add fertilizer regularly. If the culture slows or pales between harvests, it may need topping up.
Q: How should I store it?
A: Store in a cool, dry place in its original sealed packaging. Keep away from moisture.
Q: Can I use this for other algae?
A: It is formulated specifically for Spirulina Platensis. Other algae have different nutrient requirements.
Q: Do I need a refractometer?
A: It’s useful for checking salinity, which should stay between 15 and 20 PPT. Not strictly essential, but helpful.
Q: What temperature should the tank be?
A: 30–35°C for optimal growth.
Q: Do you ship within the UK?
A: Yes. All orders are shipped from the UK. Please see our shipping policy for delivery times.
Q: Can I use this with your other spirulina products?
A: Yes. This fertilizer works alongside our Live Spirulina Culture starter kit and Nutrient Medium.
To grow spirulina, you will also need:
A live spirulina culture — see our starter kit listing
A nutrient medium — for preparing a new tank
A container or tank — clear plastic or glass
A light source — natural daylight or a grow light
A thermometer and pH test kit
Pre-blended and pre-measured — no need to source individual chemicals
Formulated for Spirulina Platensis — not a generic plant fertilizer
Simple dosage — 1 tablespoon per tablespoon harvested
UK-based supplier — shipped from the UK
Works with our full spirulina range — culture, medium, and fertilizer
We also offer in our shop:
Nutrient Medium for 40L Spirulina Platensis Culture: https://thepowerofchi777.com/product/nutrient-medium-spirulina-40l/
LIVE Spirulina Culture – Active Starter Culture with Nutrient Medium for 10 litres, 100ml: https://thepowerofchi777.com/product/live-spirulina-culture-100ml/
Disclaimer: This listing is for a fertilizer for growing spirulina. It is not intended for human consumption. Keep out of reach of children and pets. Store in a cool, dry place.
