The Metamix Proportional Pump is powered by water flow, with minimal loss of pressure. The water engine powers the proportioning unit. No external power is required. The proportioning unit pumps liquid additives in direct relation to the amount of water that passes through the motor and injects the additives into the water system.

The suction and proportioning unit is built from a piston connection to the water engine, from which it derives its movement. The piston moves within a cylinder with a non-return valve. The movement of the piston within the cylinder causes the water to be pumped and the required liquid additive to be drawn through a pipe inserted into a container. It is possible to regulate the supply ratio between the additive and the water passing through the pump in models: 2502, 2504, 2510, 12502, 12504, 12510.

• In models 2500, 2501, 2505, 12500, 12501, 12505 the dosing is predetermined and cannot be changed.

• In models 2512, 2514, 12512, 12514 the drawn additive is transferred through a bypass tube directly into the main water line, without contact with the water engine. • In models 2512IN, 2514IN, 12512IN, 12514IN the drawn additive is transferred through an inlet bypass directly into the main water line, without contact with the water engine..

Problem	Check	Solution
Pump does not operate	Check that the intake and outlet valves are open	Open the valve
	Check that the water filter isn’t clogged	Clean the filter
	Check that water is flowing in the line	Open main and outlet valve
	Check that springs are not broken. Open pump lid & remove piston	Change the broken spring
	Check that cylinder is not scratched	Change cylinder
	Check that piston seals are not damaged	Change the seals
Pump does not draw	Dismantle the suction pump and check the suction seal for damage	Change the suction seal
Pump makes scratching noises	Check if there is liquid in the additive container	Add liquid to the container
	Check if suction pipe is immersed and not folded	Straighten or change the pipe
	Check suction filter to see if it is blocked and if it is immersed in the additive tank	Clean and rinse suction filter. Fill liquid into tank to cover filter.

Correct installation will prevent damages and malfunctions of the Pump.
It is strongly recommended to install a back flow preventor before the pump on the main water line. A vaccum release unit should be installed at the outlet of the Pump in order to prevent undesired suction of additive when the water line is draining.

A master valve must be installed before the pump, to be opened only for the operation of the pump to prevent water hammer damage to the pump. It is also recommended to install a filter before the pump. These should be installed according to local regulations.

The Metamix Pump operates in the following conditions:
• From a minimum flow rate of 20 L/H (5.3 Gal/H) and up to 2500 L/H (660 Gal/H)
• Temperature not lower than 4ºC (39ºF) and not higher than 40ºC (104ºF)
• Water pressure between 0.2 Bar to 6 Bar (2.9 to 85 PSI)

The additive may be added to the water flow according to the required dosing percentage:
0.2% to 2% in models: 2502,12502,2512,12512,2502P,2512IN,12512IN
0.4% to 4% in models: 2504,12504,2514,12514,2514IN,12514IN
3% to 10% in models: 2510,12510
Fixed dosage 0.2% in models: 2500, 12500
Fixed dosage 0.8% in models: 2501, 12501
Fixed dosage 5% in models: 2505, 12505

Water pressure loss:
Pressure loss in the lower flow rates 0.1 Bar and in the higher flow rates up to 1 Bar.
Models with 0.2%-2%: from 0.1 Bar up to 1 Bar in proportion to the water flow
Models with 0.4%-4%: from 0.2 Bar up to 1.2 Bar in proportion to the water flow
Models with 3%-10%: from 0.5 Bar up to 1.8 Bar in proportion to the water flow
The Metamix inlet and outlet are ¾” BSPT male thread
The additive tank should be placed beneath the Metamix pump.

Every Stroke of the pump moves a predetermined volume of water with a predetermined volume of liquid additive. To adjust the volume of liquid additive in models 2502, 2504, 2512, 2514, 12502, 12504, 12512, 12514, 2512IN, 2514IN, 12512IN, 12514IN:

1. Remove the upper U-latch from the Proportioning Lock Nut.
2. Preset the amount of additives according to the Percentage to Water Scale that is found on the proportioner.
a. Turn the Proportioning Adjuster clock-wise to increase the amount of additives.
b. Turn the Proportioning Adjuster counter clock-wise to decrease the amount of additives.
3. The marking on the scale indicates the % of the additive out of the total water flowing through the pump.
4. Turn the Proportioning Adjuster slightly, until the U-latch holes of the Proportioning Lock Nut align with the notches in the proptortioner.
5. Push the U-latch into the U-latch holes of the Proportioning Lock Nut until it is firmly in place.

• In models 2510, 12510 there is no U-latch and the adjustment is done by turning the adjustment sleeve to the desired %.
• In models 2500, 2501, 2505, 12500, 12501, 12505 there is no possibility to adjust the dosing percentage, it is predetermined by the pump model.

* DO NOT REMOVE THE LOWER U-LATCH!!! (For maintenance purpose only)