Delivery throughout the EU

Chihiros CO₂ Drop Checker Indicator – CO₂ Level Monitor for Aquariums

Trusted by 500+ aquascapers

Regular price €9,99
  • Colour shows your CO2 at a glance
  • Green tells you the level is right
  • No power or calibration needed
  • Clear borosilicate glass, discreet in the tank

You get a constant read on your CO2 at a glance: blue means too little, green is the sweet spot, yellow means back off. The glass checker hangs inside the tank and works with no electricity, no calibration and no test kit.

Fast delivery (1–5 days EU)

Carefully packed and protected

Tips from real aquascapers

Description

The Chihiros CO2 Drop Checker is a glass indicator vessel used to monitor dissolved CO2 levels in planted aquariums. It works by holding a pH-sensitive indicator solution (4 dKH reference water + pH indicator, sold separately or included) that changes color based on CO2 concentration in the water: blue = too little CO2, green = optimal, yellow = too much CO2.

How it works

The drop checker hangs inside the aquarium. CO2 diffuses through the air pocket inside the glass and changes the pH of the indicator solution. The color provides a continuous, real-time visual reference for CO2 levels without test kits or electronic sensors.

Key features

  • High-clarity borosilicate glass construction
  • Visual CO2 monitoring: blue (low) — green (optimal) — yellow (high)
  • No electricity or calibration required
  • Works in any planted aquarium with CO2 injection
  • 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.