How to Keep Your Pond Water Crystal Clear All Year Round.

Nothing spoils a beautiful koi pond like murky water. Whether it's green algae blooms, sludge build-up, or cloudy conditions, poor water clarity not only looks bad—it can stress your fish and disrupt your pond's balance. Here’s how to achieve (and maintain) crystal clear pond water all year round, the easy way.

1. Start with Strong Filtration🫧

A reliable mechanical and biological filtration system is the backbone of clear water.

• Mechanical filtration removes visible debris and particles.
• Biological filtration breaks down fish waste and organic matter using beneficial bacteria.

For small to medium koi ponds, we recommend the EazyPod Automatic system for powerful, low-maintenance filtration.

2. Add a UV Clarifier☘️

A UV clarifier helps combat green water caused by floating algae.

• UV light kills microscopic algae as water passes through the unit.
• This is especially useful in spring and summer when algae growth spikes.

3. Don’t Overfeed Your Koi🥄

Excess food sinks and breaks down, creating waste and feeding algae.

• Feed high-quality food like Cloverleaf Absolute Growth Pellets in the right portions.
• Remove uneaten food after 5 minutes.

Browse our full Pond Fish Food Collection here ! 

4. Use Beneficial Bacteria🦠 

Regular doses of pond-safe nitrifying bacteria treatments just like our Cloverleaf Absolute Pond Pearls help break down organic waste in filters, gravel, and liner creases.

• Use monthly for best results.
• Natural, eco-friendly solution that supports fish health.

5. Vacuum or Net Out Debris🍂

Leaves, fish waste, and leftover food settle on the bottom. Over time, they decay and cloud the water.

• Use a pond vacuum or long-handled net to clean the bottom.
• Add a skimmer to catch debris before it sinks.

6. Aquatic Plants for Natural Filtration🌱

Plants like water hyacinth, hornwort, and iris absorb excess nutrients from the water.

• Less nutrients = fewer algae outbreaks.
• Plants also provide shade, which reduces sunlight-driven algae growth.

7. Perform Partial Water Changes💧

Replacing 10–20% of pond water every 1–2 weeks helps dilute pollutants.

• Always dechlorinate tap water before adding it to your pond. For best results use our Cloverleaf Absolute 2x concentrate Dechlorinator. 
• Helps reset water balance and supports fish health.

📍Bonus Tips:

• Check your ammonia and nitrate levels regularly.
• Maintain proper aeration, especially in warmer months.
• Don’t overcrowd your pond—too many fish = too much waste.

Clear water isn’t just for looks—it’s a sign of a healthy pond. With the right equipment, habits, and a bit of pond care know-how, you can enjoy sparkling water and happy koi all year round.

Need pond filters, UV clarifiers, or water treatments?🎯

Shop our full range at Pond Supplies Essex.