What is a flow restrictor and why should I use it?
Reverse osmosis units work by creating a back pressure on the exiting water to force the pure water through membrane. This back pressure is created by adding a flow restrictor on the waste pipe and unless this is fitted you will never achieve good quality water.The new generation of D-D RO units now have a flow restrictor with a tap on the top of it. This tap allows the user to take the restrictor out of line allowing a greater water flow to periodically flush the membrane and help to keep it clean, which in turn enhances the life of the membrane and aids water quality.To flush the membrane simply open the tap so that it is in line with the restrictor.Once the flushing has been done (flush for several minutes) then the tap must be closed. The tap will be closed when it is turned 90 degrees to the direction of flow and will begin to cause back pressure again.This flushing action should be carried out every 2 weeks or so to keep the membrane in top condition.

FAQs
- Why does the light on the D-D ATO sensor change?
- Why is my D+D ATO sensor light red

FAQs

Why does the light on the D-D ATO sensor change?

The sensor on the DDATO has different light colours and patterns to warn of faults or show its status.

Flashing blue and red LED. The unit has been powered on and it is going through its startup process.

Flashing blue LED. A low water level has been detected and the top up unit is operating the pump to refill with fresh water.

Short intermitting blinking blue LED. The waterlevel is above the failsafe sensor and the unit has been temporarily deactivated. When the water level returns to below the emergncy sensor the unit will return to normal operation. The failsafe sensor can be activated after each top up on nano aquariums, this is normal and no action needs to be taken.

Solid Blue LED. The top up unit is in normal standby mode.

Flashing red LED. Alarm mode has been activated. The unit has detected an issue and or the freshwater reservoir is empty.

Why is my D+D ATO sensor light red

A red light on the sensor can indicate one of these things.

The sensor's inbuilt emergency shut-off timer has been activated

When the unit performs its first top-up after being powered on it will store the time taken in its memory. If for any reason the top-up unit is activated for longer than 6 times this the sensor will assume there is a problem or that the freshwater reservoir is empty, shut down and show the red warning light.

Corrective action to set the ATO back into normal operation mode and clear the alarm status, power the unit down from the mains plug socket for a few seconds and then power it back up. The sensor should flash red/blue a few times as it reinitialises and then returns to normal operation mode with a solid blue status light.

The sensor is detecting a fault with the ATO pump.

If the pump cannot run the sensor may go into alarm mode and turn off power to the pump. If this is the situation you will notice that when the top-up activates the pump will not turn on and the status light will immediately show red and not flash blue until time out occurs.

Corrective action:_Disconnect the unit from mains power, check that the connector where the power lead and pump plug-in has not become wet and that the impellor in the pump is clean and free to move.

The freshwater reservoir is empty or the sensor is impaired

No water in the reservoir or microbubbles in the water are causing issues with the sensor detecting the water level. Check that the sensor is not in an area where it is subject to small bubbles, eg near the outlet from a skimmer.

Corrective action: If this has occurred check that the sensor is clean, the impellor in the pump is clean and free to move, the freshwater reservoir is not empty, and there is nothing that could be causing the sump water level to fall unexpectedly.

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Next Day Shipping Upgrade - Cut off Midday (12 pm)

Please Note: We only deliver ponds and pond plants on our own delivery vehicles!

The blue highlighted area on the map below is where we deliver on our own vehicle! Unfortunately, if you are not in one of these postcode zones we are unable to deliver certain items such as plants, small glass items and selective other products.

We offer a few different delivery options depending on the size and value of your order.

Orders over £50 qualify for free mainland UK (excludes Northern Ireland) delivery which will arrive within 3-5 working days of the order being processed.

Residents of Northern Ireland, please provide your EORI or XI Number.

If you do not have one, please follow the information at https://www.gov.uk/eori

Orders Below £50 in Mainland UK will be charged a standard delivery fee of £5.99.

Additional Shipping Charges

For any orders that do not include Aquariums, the below is charged:

Next Working Day Parcel Delivery to Mainland UK - £7.99 OR £2.99 if the order is over £50

Standard Parcel Delivery to Northern Ireland £8.99

Standard Parcel Delivery to Scottish Highlands & Islands £9.99

Standard Parcel Delivery to Jersey & Guernsey £12.99

For all Aquarium deliveries (Excluding biOrbs & Smaller Aquariums), the below is charged:

Next Working Day Pallet Delivery - £20

2 Hour Booking Slot Pallet Delivery - £20

Pallet Delivery to Northern Ireland - £38

Pallet Delivery to Isle of Wight (PO36 and Above) and Scottish Highlands (AB, PH, IV1-36, IV63, KW1-14, KY, PA21-41) - £38

Pallet Delivery to Southern Ireland - £48

Pallet Delivery to Offshore postcodes (KA27-28, PA20, PA42-49, PA60-90, ZE, JE, GY. IM) - £70

Pallet Delivery to the Scottish Isles (IV40-56, KW15-17) - £90

Pallet Delivery to Outer Hebrides (HS) - £120

D-D Aquarium Solutions Flushing Flow Restrictor 300Ml/Min For Ro50