Delivery throughout the EU

MasterLine Crystal Clear 500ml – Aquarium Water Clarifier for Cloudy Water

Trusted by 500+ aquascapers

€16,14
  • Clears the haze your filter keeps missing
  • Visible results in 6 to 12 hours
  • Leaves pH, KH and dosing untouched
  • Shrimp-safe at the recommended dose
  • 1 ml per 10 litres of water

Cloudy water is usually fine organic particles slipping straight through the filter. This clarifier clumps them together so the filter can finally trap them, and clarity typically returns within 6 to 12 hours with no change to your pH, KH or nutrient levels.

Fast delivery (1–5 days EU)

Carefully packed and protected

Tips from real aquascapers

Description

MasterLine Crystal Clear — Fast-Acting Water Clarifier for Freshwater Aquariums

Cloudy or hazy aquarium water is usually caused by tiny organic particles too fine for your filter to catch on its own. MasterLine Crystal Clear works by binding these microscopic particles together into larger clumps that your existing filter can trap easily — restoring visual clarity without touching your water chemistry, nutrient dosing, or pH balance.

What it does beyond clearing haze

  • Removes cloudiness: compacts fine suspended particles so your filter can capture them.
  • Boosts oxygen concentration: supports better gas exchange in the water column.
  • Enhances plant pearling: a visible side effect of improved oxygen levels in planted tanks.
  • Reduces algae risk: fewer suspended organics means less fuel for algae blooms.
  • Safe for shrimp: compatible with all freshwater livestock when dosed as directed.
  • Doesn't alter pH, KH, or nutrients: works purely on particle clarity, not water chemistry.

Specifications

Volume 500ml
Use case Freshwater aquariums only
Dosage 1ml per 10L of aquarium water
Frequency Max. twice per week
Requirement Water KH must be ≥ 2°dH
Includes Graduated dosing cup (2.5–20ml)

How to use

Shake well before use. Dose 1ml per 10L of water, ideally 2–3 days after a water change if cloudiness appears. Add the solution slowly over 20–30 seconds in an area of strong water flow, away from fish, shrimp, and plants, and dose during the lighting period. Results typically appear within 6–12 hours — the water may look slightly hazier right before it clears completely, which is normal as particles clump together. Clean your filter and vacuum the substrate more frequently while treating persistent cloudiness.

Frequently Asked Questions

Will this harm my shrimp?
No — MasterLine Crystal Clear is safe for shrimp and all freshwater livestock when dosed according to instructions (max twice weekly, correct KH).
Can I use it in a saltwater or reef tank?
No, this product is formulated for freshwater aquariums only.
Why does the water look worse right after dosing?
The product first causes fine particles to clump together, which can briefly increase visible haze before your filter clears the larger clumps within 6-12 hours.
What if my water is still cloudy after dosing?
Check that your filter is clean and running well — clarifiers only work if the filter can physically capture the clumped particles. Increase filter maintenance frequency if cloudiness persists.

  • Professional support

    Expert help when you need it

  • Delivery throughout the EU

    Delivery to all EU countries

  • Secure payment

    Fast and secure payment options

  • Easy returns

    Лесно връщане и замяна
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FAQ

What makes Aquarium Boutique different from mass-market stores?

We don't sell everything — we sell only carefully selected products, personally tested. Every item is chosen with a clear purpose: to work well and last long. You don't need to guess about quality — we've already done that for you.

Do you ship to my country?

Yes, we ship across all of Europe. For Bulgaria we work with BOX NOW and Speedy — fast and reliable home or locker delivery. For other EU countries we use international courier services.

How quickly will I receive my order?

For orders within Bulgaria, we typically deliver within 1–3 business days. For other EU countries — usually 3–7 business days depending on location.

Can I return a product if I'm not satisfied?

Yes. If something doesn't meet your expectations — contact us. We have a clear and fair return policy. Your satisfaction matters to us and we will find a solution.

Do you offer advice on product selection?

Absolutely. Our team keeps aquariums and knows the products personally. Write to us — we'll help you choose the right solution for your tank, budget and experience level.

Are your products tested and approved?

Yes. Every product in our store has gone through our personal selection and testing process . We only work with trusted brands and don't list products we don't believe in.

What payment methods do you accept?

We accept all major payment methods — credit and debit cards, PayPal, and cash on delivery for Bulgaria. All payments are secure and encrypted.

How can I track my order?

After your order ships, you'll receive an email with a tracking link. You can follow the status in real time directly through the courier's website.