GEL: Proportional Polyphosphate Dosers for Boilers

The MiniDOS Anti-Limescale Solution (Mechanical/Electronic)

Problem: If the dispenser is of poor quality or not proportional, it wastes product and fails to protect the boiler during peak water demand. Excessive amounts of polyphosphates are harmful; insufficient amounts do not block limescale.

Solution: GEL proportional dosers (MiniDOS) solve this problem by calibrating the product injection based on the water velocity.
In this section, you'll find both mechanical models (MiniDOS, which uses water pressure to dose, without electricity) and electronic models (Genius, with a microprocessor, for maximum precision). Both use the proportional principle for perfect treatment.

GEL Refills: Don't get the wrong type!

Charging is the heart of the system. They are not universal across brands:
🔹 **Powder/Ball Refills:** For hydrodynamic dissolving dosers (old D Series).
🔹 **Stick/Liquid Refills:** For MiniDOS models or dosing pumps that require a pre-dosed and sealed refill for maximum hygiene and ease of use.
Always purchase the refill size that your dispenser originally used.

Frequently Asked Questions about Gel Dispensers

1. Do I need to install a filter before the GEL dispenser?

Yes, it is highly recommended. Dispensers (especially mechanical models) have very precise parts. Sand or rust from the meter can clog or wear out the dosing pump. Installing a **Self-Cleaning Filter** upstream protects the dispenser and extends its life.

2. What is the difference between the mechanical MiniDOS and the electronic Genius?

The mechanical MiniDOS uses water pressure to move the dosing piston (no electricity required). The Genius (electronic) model uses a microprocessor and an electric pump, offering superior precision and finer control, ideal for applications with highly variable water flow.

3. Does the dispenser work on cold water?

Yes, but only for prevention. Polyphosphate creates a film on all pipes. However, its anti-scale action (preventing precipitation) is essential only on pipes and hot water exchangers, where scale builds up due to rising temperatures.