BWT bestaqua 16 ROC

Our ROC systems use a T1.25A fuse. If the fuse blows repeatedly, the issue may be:

1. A short circuit (on PCB or in 230 V wiring)
2. A defective capacitor
3. A faulty pump or coupling, making it difficult for the rotor to spin, causing increased power consumption

We recommend pretreatment of feed water:

“If total hardness exceeds 10 °dH or if the ratio of temporary to total hardness is more than 80%, pretreatment is necessary to ensure product reliability and performance.” This statement is included in section 2.2 of the ROC EBA (Operating Conditions) and applies to all RO products.

Note: This is a recommendation – the membrane can technically handle harder water but may require more frequent replacement.

Our ROC systems have been developed and tested according to:

• EMC Directive 2014/30/EU
• Low Voltage Directive 2014/35/EU
• RoHS Directive 2011/65/EU

Harmonized standards:

• IEC 61000-3-2:2018
• IEC 61000-3-3:13/AMD1:2017
• IEC 61000-6-1:2016
• IEC 61000-6-3:2020

A valid EU Declaration of Conformity and CB Certificate are available.

Yes. For hotels, large kitchens, or big restaurants, we offer:

• Hydropneumatic tanks from 500 to over 2,000 liters
• Systems often include:
  • Booster pumps
  • Automatic refill controllers
  • Pressure switches

This creates a fully automated, high-pressure purified water system - ideal for industrial-level demand.

A pressure tank contains:

• One chamber for purified water
• One chamber for compressed air, separated by a diaphragm or bladder

As water fills the tank:

• The air compresses
• This compression creates water pressure when an outlet is opened
• Once the pressure drops to a certain level, the RO system restarts to refill the tank

Think of it as a spring-loaded water reserve, ensuring instant availability.

Our ROC systems are designed for durability and serviceability.

We recommend replacing the membrane annually or at the latest every two years to prevent stagnation-related growth (e.g., biofouling) and mechanical damage.

In addition to time-based replacement, membranes should be changed when permeate output drops by 30% from the original value.

We also recommend descaling the concentrate line yearly with BWT OsmoCare Tabs – or twice a year in extremely hard water regions (e.g., Croatia or Greek islands with karst water).

A single RO system may feed:

• Beverage stations (coffee, tea)
• Ice makers
• Food prep sinks
• Dishwashers
• Refill water stations

A pressure tank:

• Acts as a central hub with pressurized RO water
• Prevents pressure and flow drops, even during simultaneous usage

An organic smell can occur after prolonged downtime. This usually disappears after a few minutes of flushing. As mentioned in section 6.3 of the EBA:

"If the system has been out of operation and disconnected from power for an extended period (e.g., during vacation), a 10-minute flush is required before reuse. Make sure the rinse water can drain freely. The flushed water should be discarded."

A few years ago, membranes were commonly preserved wet in a 1% sodium thiosulfate solution to maintain performance and prevent microbial contamination.

Today, most suppliers – including us – deliver membranes in a dry state, which is easier to handle and ensures a longer shelf life. Preservation only applies to new membranes. Once a membrane has been used, preservation chemicals cannot be re-applied.

Yes. In HORECA settings, short peak windows may require 50–100 liters in 30 minutes. A standalone RO system cannot deliver this immediately.

A pressure tank with 200–500 liters capacity ensures sufficient reserve during high-demand periods.

Yes. In case of:

• Power outages
• Pump failures
• Low feed water pressure

…the pressure tank maintains temporary business continuity. It ensures critical functions can continue without interruption for a short period.

RO systems filter water slowly, molecule by molecule.

For example, BWT bestaqua ROC systems produce around 2.0 to 3.0 liters per minute. Without a buffer (i.e. a tank), the system cannot meet sudden spikes in demand - like during a busy restaurant service.

Without a pressure tank:

• Every small water demand immediately triggers the RO pump
• This causes frequent pump cycling, reducing the lifespan of:
  • Pumps
  • Solenoid valves
  • Non-return valves

A pressure tank absorbs small demands, reducing stress and extending component life.

No. RO systems output purified water at low pressure, typically just slightly above atmospheric pressure. However, many appliances (e.g. espresso machines, combi ovens, ice makers) require a minimum inlet pressure, often between 1.5 and 3 bar.

A pressure tank stores RO water under compressed air, delivering it with immediate usable pressure.

Our ROC products undergo a complete End-of-Line functional test. Each individual unit is connected to a testing station and fully tested.

Production at BWT Dynamics is certified according to ISO 9001.

This message may appear when the pump pressure drops below 6 bar. Possible causes include:

1. Defective pump head
2. Low or fluctuating inlet pressure
3. Membrane with higher flow rate
4. Clogged pre-filter
5. Bypass valve on membrane head is open
6. Warm water temperature – this may occur seasonally, especially after winter when water warms up

The 16ROC pump features a cooling circuit connected to the concentrate outlet. This circuit is not visible externally. Possible causes for a "Pump Cooling" error include:

1. Defective pump motor
2. Damaged pump cable and/or connector
3. Motor overload (e.g. due to dirt or particles damaging the pump head)
4. Defective PCB