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MasterLine GH Plus – GH Mineral Booster for RO & Soft Water Aquariums

Trusted by 500+ aquascapers

€20,17
  • Raises GH without touching KH
  • Calcium and magnesium in a 4:1 ratio
  • Precise water for Caridina shrimp
  • Dissolves fully, measuring spoon included
  • Gives plants the minerals RO water lacks

RO water and very soft tap water are a blank slate with none of the minerals your plants and shrimp need. This soluble salt mix puts them back, raising GH only and leaving KH untouched, so you set hardness without dragging the rest of your parameters along.

Size

Fast delivery (1–5 days EU)

Carefully packed and protected

Tips from real aquascapers

Description

MasterLine GH Plus — Mineral Booster for RO Water & Soft Water Aquariums

Reverse osmosis (RO) water and naturally soft tap water are stripped of the minerals that many aquatic plants, fish, and shrimp need to thrive. MasterLine GH Plus is a 100% soluble salt mixture designed to remineralize this "empty" water — raising general hardness (GH) precisely, without touching carbonate hardness (KH), so you keep full control over your water parameters instead of adjusting both at once.

Why hardness matters — and why this product is built the way it is

  • Calcium & magnesium in a 4:1 ratio: matches the balance most aquatic plants and livestock use most efficiently, rather than a generic mineral blend.
  • Adds a touch of potassium: supports plant metabolism alongside the primary Ca/Mg minerals.
  • Raises GH without raising KH: lets you dial in hardness independently of pH-buffering carbonate hardness — critical for shrimp keepers targeting specific GH/KH combinations.
  • Ideal for Caridina shrimp & soft-water species: many popular shrimp and soft-water fish need mineralized water below typical tap-water hardness, which this product provides precisely.
  • Compatible with all aquatic life including shrimp, when dosed as directed.

Specifications

Format 100% soluble salt powder
Best for RO/osmosis water & water with GH below 6°dH
Dosage 1 measuring spoon (~3g) per 15L → raises GH by 6°dGH
Mineral profile Calcium & magnesium (4:1 ratio) + potassium
Effect on KH None — GH only
Includes Measuring spoon

How to use

For fastest dissolution, add the salts gradually to a separate container of water while stirring vigorously, then pour the fully dissolved solution into the aquarium — this avoids undissolved granules settling on the substrate. Use one measuring spoon (~3g) per 15L of water to raise GH by approximately 6°dGH; adjust the amount based on your target hardness and current GH reading. Because the product is hygroscopic (absorbs moisture from air), reseal the container tightly and store it away from humidity between uses.

Frequently Asked Questions

Will this affect my KH or pH?
No — MasterLine GH Plus is designed to raise general hardness (GH) only, without affecting carbonate hardness (KH) or destabilizing pH.
Is it safe for Caridina and Neocaridina shrimp?
Yes, it's compatible with all forms of aquatic life including shrimp — just dose to match the specific GH range your shrimp species requires.
Do I need this if I use tap water?
Only if your tap water's GH is naturally low (below 6°dH) or if you're mixing in RO/osmosis water that needs remineralizing before use.
How do I know how much to dose?
Test your current GH first, then use the dosage guide (1 spoon per 15L raises GH by 6°dGH) to calculate how many spoons you need to reach your target hardness.

  • 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.