# Tetra pH/KH Minus liquid 250 ml – Tetra water hardness and carbonate hardness reducer for aquariums

**URL:** https://aio.lv/en/product--tetra-t328853--12389698
**Data updated:** 2026-04-26 21:01 (EEST)
**Category:** Aquarium Supplies
**Manufacturer:** Tetra
**Manufacturer code:** T328853
**EAN:** 4004218328853
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 18.49 €
**Prices and availability valid until:** 2026-07-22 23:59
**Price without VAT (21%):** 15.28 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--tetra-t328853--12389698

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 13.07.2026 | free |
| Pickup points | 16.07.2026 | 1.89 EUR |
| Courier delivery to door | 16.07.2026 | 4.99 EUR |

## Summary description

Tetra pH/KH Minus is a 250 ml liquid formulated to reduce general water hardness (GH) and carbonate hardness (KH) in freshwater aquariums. The product helps lower pH buffering capacity and softens tap water to create suitable conditions for soft-water fish and plants. Use according to dosing instructions to adjust water parameters safely during water changes and setup.

## Long description

Tetra pH/KH Minus liquid 250 ml is a concentrated aquarium treatment designed to reduce general water hardness (GH) and carbonate hardness (KH) in freshwater aquaria. The formulation lowers the buffering capacity of water to enable gradual pH adjustment and to soften tap water so that conditions better suit soft-water fish species and aquatic plants. The product is intended for regular use during water changes and for conditioning new aquarium water before adding it to the tank.
Advantages
Tetra pH/KH Minus delivers controlled reduction of carbonate hardness and overall water hardness in a liquid form that is easy to dose and distribute evenly in aquarium water. The liquid format enables targeted adjustment of buffering capacity so you can lower pH stability when required, while following the manufacturer dosing instructions helps minimise stress to livestock. The product is suitable for incremental corrections and for preparing replacement water during maintenance.
Suitable for
 Freshwater aquariums requiring softer water and lower carbonate hardness
 Species that prefer low GH/KH and slightly acidic conditions
 Preparing tap water for water changes or new tank setups
When it may not be suitable
This product is not intended for use in marine or brackish aquaria where higher hardness and buffering are required. It may be unsuitable for systems with livestock that require stable, high carbonate hardness or species that tolerate only specific narrow pH ranges; abrupt changes in KH or pH can stress fish and invertebrates.
Key specifications
 Form: liquid
 Volume: 250 ml
 Effect: reduces carbonate hardness (KH) and general hardness (GH)
 Application: freshwater aquaria
 Dosage: follow manufacturer dosing instructions on the label for controlled adjustment
How to use
Use Tetra pH/KH Minus by following the dosing instructions printed on the product label. Measure the current KH/GH and pH of your aquarium water before treatment and calculate the required dose for the desired change. Add the measured dose to aquarium water gradually, preferably during water changes or in small increments, and retest water parameters after treatment. Avoid large single adjustments; if larger changes are needed, perform them over several treatment steps to reduce stress to fish and plants.
What to consider before purchase
 Check that your aquarium is freshwater and that the intended livestock benefit from reduced KH/GH.
 Measure existing pH, KH and GH to determine how much adjustment is needed.
 Confirm you can follow incremental dosing and have test kits to monitor changes.
Usage recommendations
Perform gradual adjustments and monitor parameters with reliable test kits. Use the product during water changes or when conditioning new water, and avoid rapid or repeated large reductions of KH/pH to protect fish, invertebrates and plant health.

## FAQ

### How much does the Tetra pH/KH Minus liquid 250 ml cost, and is it available for purchase?

The price is 18.49 € (valid at the time of publication and already includes all taxes). The item is available for order — 70 pcs. are in stock, and you can place your purchase right now with delivery across Latvia and Europe or choose pickup at the Riga collection point. We offer favorable purchase terms, including the option to split the payment into convenient monthly installments. Availability and price are updated in real time, so we recommend placing your order in advance.

### If I order this product today, when will I receive my order?

If you place your order today, delivery will be as fast and convenient as possible. You will be able to pick up your order on 13.07.2026 at the Riga pickup point or choose delivery across Latvia and Europe. We carefully inspect every purchase and pack it securely for safe transportation.

### What payment options are available?

AiO.lv offers several payment methods: Bank transfer, Bank cards on-line, Apple Pay, Google Pay. All transactions are 100% secure and encrypted.

### Can this product be purchased for a company (with VAT)?

Yes. AiO.lv works with legal entities in Latvia and across Europe. The product price already includes VAT. For certain product categories, as well as for companies from other EU countries with a valid VAT number, a 0% VAT rate may apply. We issue the invoice immediately after the order is placed, support electronic BIS invoices, and automatically generate all necessary accounting documents. You can complete the purchase for a company online — simply select the company profile and choose bank transfer as the payment method during checkout.

### What is the warranty period?

All Tetra products come with an official 2 Years warranty. It covers all manufacturing defects and malfunctions that may occur during use. The warranty is valid at all authorized Tetra service centers and through AiO.lv

### Can the product be returned after purchase?

Yes, you can return the product within 14 days of purchase if you bought it as a consumer (not a legal entity). Returns are possible without giving any reason — the main condition is that the product retains its original appearance and full set of accessories. We will make the process as simple and convenient as possible: just contact our customer support team, and we will help you arrange the return.

### Where should I contact for warranty service?

For warranty-related questions you can contact the AiO.lv (SIA VSPRO) customer support team. More information about warranty service: https://aio.lv/en/warranty

## Image

https://aio.lv/img/cache/product/12389698/68524164_large.webp