# Water conditioner sera PH/KH-minus bottle 250 ml – lowers pH and KH

**URL:** https://aio.lv/en/product--sera-04341--12268167
**Data updated:** 2026-04-16 05:59 (EEST)
**Category:** Aquarium Supplies
**Manufacturer:** sera
**Manufacturer code:** 04341
**EAN:** 4001942035507
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 15.49 €
**Prices and availability valid until:** 2026-07-23 23:59
**Price without VAT (21%):** 12.80 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--sera-04341--12268167

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 14.07.2026 | free |
| Pickup points | 17.07.2026 | 1.89 EUR |
| Courier delivery to door | 17.07.2026 | 4.99 EUR |

## Summary description

sera PH/KH-minus is a 250 ml water conditioner designed to lower pH and carbonate hardness (KH) in aquarium and pond water. It adjusts water chemistry for sensitive freshwater species, helping achieve stable pH/KH levels for breeding, acclimation, and general aquarium maintenance.

## Long description

sera PH/KH-minus is a 250 ml water conditioner designed to lower and regulate pH and carbonate hardness (KH) in aquarium and pond water. It is intended for keeping soft and slightly acidic water conditions required by sensitive freshwater species such as discus and angelfish, and for correcting elevated KH or pH caused by natural metabolic processes.
Advantages
The product lowers pH and reduces carbonate hardness quickly and precisely, enabling controlled adjustment of water chemistry. By stabilising KH and pH values, it helps create suitable keeping conditions that support fish vitality and successful reproduction or acclimation.
Suitable for
Softwater-loving tropical fish (e.g. discus, angelfish)
Breeding and fry rearing requiring low KH and slightly acidic water
Acclimation when moving fish between tanks with different water hardness
Correction of elevated KH or pH in aquaria and ponds
When it may not be suitable
Not all freshwater species require lowered KH or pH; fish that prefer neutral to hard water or species kept in planted tanks with specific substrate buffering may be negatively affected by reducing KH and pH. Excessive or repeated use without testing can destabilise water chemistry.
Key specifications
Volume: 250 ml
Function: lowers pH and carbonate hardness (KH)
Intended use: aquaria and garden ponds with freshwater
Effect: rapid and precise regulation of pH and KH
How to use
Measure current pH and KH before treatment. Dose sera PH/KH-minus according to the manufacturer’s instructions and the water volume to be treated, then retest water parameters. For establishing stable softwater conditions, first adjust carbonate hardness to about 4°dKH and afterwards use an appropriate peat product in the filter for long-term maintenance. Avoid overdosing and adjust treatment frequency based on regular water tests.
What to consider before purchase
Check current pH and KH values with reliable test kits
Ensure the target species require lowered KH and slightly acidic water
Plan follow-up measures (e.g. peat filtration) for long-term stability
Usage recommendations
Use in combination with regular water testing and, for permanent softwater conditions, adjust KH to about 4°dKH then add peat filter media such as sera super peat to maintain slightly acidic, soft water.

## Specifications

| Feature | Value |
|---|---|
| Volume | 250 ml |
| Product type | Water conditioner |

## FAQ

### How much does the sera PH/KH-minus water conditioner 250 ml cost, and is it available for purchase?

The price is 15.49 € (valid at the time of publication and already includes all taxes). The item is available for order — 10 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 14.07.2026 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 sera 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 sera 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/12268167/68188622_large.webp