Delivery throughout the EU

KH Builder – Adjust KH and pH with Precision

Trusted by 500+ aquascapers

€9,00
  • Steady pH instead of daily swings
  • Raises KH without touching GH
  • Adds potassium for hungry plants
  • Made for RO-based water preparation
  • Liquid dosing in small, precise steps

When KH drops too low, pH starts swinging and everything in the tank feels it. This liquid raises carbonate hardness for a steady pH and adds potassium at the same time, which heavily planted tanks burn through faster than anything else.

Fast delivery (1–5 days EU)

Carefully packed and protected

Tips from real aquascapers

Description

KH Builder is a liquid supplement that raises carbonate hardness (KH) and potassium levels in aquarium water. It is used to stabilize pH through KH buffering and to provide potassium — an essential macronutrient for aquatic plant growth that is often depleted in RO-based or frequently changed aquariums. Suitable for use alongside RO remineralizers when KH needs to be adjusted independently of GH.

Key benefits

  • Raises KH to stabilize pH and prevent pH swings
  • Adds potassium — essential macronutrient for aquatic plant health
  • Compatible with RO water preparation
  • Precise liquid dosing — easy to adjust in small increments
  • Available in 500 ml

When to use KH Builder

Use when KH is too low (below 3–4 dKH) causing pH instability, or when additional potassium is needed for plant growth alongside a GH booster. Particularly useful in heavily planted aquariums with high plant uptake of potassium.

Pair with

  • GH+ ONE PLANT — GH remineralizer for RO water
  • Basic Grow — NPK fertilizer

  • 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.