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XL Flood and Drain Flood and Drain 11LTR Flood and Drain Brain

The new Alien® flood and drain hydroponic system consists of a new heavy-duty steel wall mounted control module. The module is microprocessor controlled so there are no moving parts inside making this the most reliable flood and drain system on the market today.

The intelligent module will pause at the maximum flood height for 20 seconds ensuring an equal water level in all pots. Even if you forget to top up your tank the system will drain at the end of the cycle even if there’s not enough water in the tank to fill the system completely.

Deep Water Culture is a method of growing crops with their roots directly submerged in a nutrient rich, highly oxygenated solution. DWC tends to be well suited to one or two pots and more frequent nutrient changes are required. RDWC is a very similar method, but constantly recirculates the solution and is well suited to multiple pots.


A water tank can be connected to both DWC or RDWC systems. The tank contains PH and EC adjusted solution. It is drip fed to the system and maintains optimal solution levels as the plants use the solution in the system. Dependent on your requirements you can use the top off reservoir to correct any movement in EC/PPM readings or PH.


The ideal nutrient solution temperature is between 18-20 degrees. At this temperature it is far less likely your plants will contract a root disease. When nutrient solution rises above 20 degrees the plants are unable to assimilate the oxygen as effectively, the risk of anaerobic respiration in the root-zone is increased leading to Pythium and other bad news! The things to look out for and prevent are brown slimy roots that have an unpleasant smell to them. You will see the health of your plants deteriorate fairly rapidly should you have root problems.


To avoid such issues you could consider installing a water chiller. You should always over estimate the size and capacity of chiller that you purchase. Chillers can be fitted to systems in a range of ways; the most common uses the return pump to recirculate the nutrient solution.


When placing young plants in your system it is likely that you will be using a net pot to hold a small amount of medium to secure the plant. It is advisable that you put a 1-2inch layer of clay pebbles or “grow stones” at the base of the net pot. A barrier of non-wicking medium will prevent constant moisture being drawn from the pot below.  If you allow Rockwool or coco mediums to touch the water in the system, you will encounter stem rot because the stem will not be able to dry out adequately.


When using organic nutrients or additives in your RDWC system it is especially important that you perform thorough cleaning and sterilisation of the system between crops. This may include measures such as replacing pipework every 6 months. You can also use products such as H202 in order to ensure your system is properly cleaned and free of unwanted pathogens.


During growth and bloom cycles it is recommended that you perform regular full change outs of the water in your system. You will need to do this every 1-2 weeks to ensure that the plants have the correct nutrient profile available.




Hydroponics Award

Just another award we've picked up for innovation and product design, oh and some pics of the ladies from our previous hydroponics expo's

Hydroponics Stand

Some more pictures of our stand at various hydroponic events and shows.

Like us on Facebook or follow us on twitter to be eligible to win 1ltr Acid Drop.

Hydroponics Acid Drop Odour Neutraliser Competition


Our preferred payment method is credit or debit card. We also accept Paypal, bank transfers and cheques. Cheques must be cleared before we can ship goods. 


We take great care packaging every item to ensure your items arrive safely. All items come in plain packaging. Once your order has been processed and we have received cleared payment, your item will be dispatched promptly from our UK based warehouse. All orders are sent by 1st class post or other 24 hour courier (for the courier service a surcharge will apply for items sent to the Scottish Highlands, offshore Islands and Northern Ireland, you will receive an email detailing the surcharge). Usually you will receive your item within 2 working days.


Customers should satisfy themselves that any item choice made is suitable for their intended purpose or use. We pride ourselves in top quality British customer service. In the rare event that you have a problem with your item please contact us and we will be more than happy to help.

Items purchased may be returned for a full refund within 14 days of purchase. The item must be unused and in the original packaging.





Contact Us

01403 888276


Alien Hydroponics
Unit 8 Oakhurst Business Park
West Sussex
United Kingdom
RH13 9RT