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Top 10 Water-saving tips for Laboratories

For World Water Day, we’ve brought together our top 10 water-saving tips for laboratories that are looking to work more sustainably.

Water-usage in laboratories

Laboratories are large users of resources; both water and energy. Water usage in labs can be considerable with many having one or more of the following: ice machines, autoclaves, glasswashers, water baths, aspirator pumps, evaporators and condensers. In fact, the water required to cool just one condenser for 17 days is more than the average 4-person household uses in a year![1]

Many organisations in all industry sectors are looking to reduce their water consumption and the associated costs, whilst improving their sustainability. Below, we have highlighted some basic working practices and simple water-saving tips for laboratories that could help you reduce your water usage.

Water-saving tips for laboratories

  1. Fix leaks: Let’s start with the most obvious one: report and fix any leaks or dipping taps.
  2. Introduce closed-loop systems: There are many processes and instruments that require water for cooling. Traditionally, this is achieved by running tap water continuously (and then down the drain). Not only does this use a lot of tap water, it can also leave laboratories vulnerable to flooding, when unattended. Consider investing in closed-loop water re-circulation equipment for your cooling requirements. See below for more information.
  3. Use equipment efficiently: Autoclaves and glasswashers are two of the biggest water consumers in the laboratory. Whenever possible, only run a cycle when they are full and efficiently loaded. You could coordinate with other labs/departments to make maximum use of each cycle.
  4. Glasswashers: In addition to ensuring that machines are fully and efficiently loaded…
    If you’re planning to purchase a new washer: do some homework. Some manufacturers offer more energy-efficient models that also require less water during their rinse cycles.
  5. Use the right water: The processes involved in producing high-quality or analytical lab water require both energy and water (distillation, deionisation, reverse osmosis), and consumables. So, use this water conservatively and only when required for the application. Try to use the correct water purity (grade/type) for your application. If you only use small volumes of purified water, it may be better to purchase it, ready-made.
  6. Switch to a vacuum pump: Replacing your aspirator pumps with vacuum pumps can offer significant water savings. Vacuum pumps do not require any water for operation.
  7. Install timers: Ensure that equipment and instruments that require large amounts of water, such as ice machines, are switched off when not in use. By using timers, equipment can be turned off during evenings and weekends, but ready for use when you next arrive in the lab.
  8. Create signs: Use signs to remind other users when pieces of equipment can be switched off without impacting daily workflows.
  9. Consider water alternatives: For some applications, there is an alternative to using water. For example, Lab Amor™ beads can be used instead of water in water baths and instead of ice in ice buckets.
  10. Check the water flow: If equipment must have mains-to-drain cooling, check whether the water flow is greater than required. If so, it may be possible to fit a flow restrictor to save water usage.

Organisations such as S-Labs, My Green Lab, and Green Light Laboratories, and initiatives like LEAF (at UCL) have plenty of resources and tools to assist laboratories that are looking to work more sustainably.

Focus: Chillers / Closed-loop systems

Traditionally, tap water is used in many applications for cooling in the laboratory. These include rotary evaporators; condensers (for glass apparatus), Kjeldahl instruments; measuring cells; CCD cameras; calorimeters; polarimeters; refractometers; soxhlet apparatuses.

Recirculating coolers and chillers provide an environmentally-friendly alternative to cooling with tap water. Water is recirculated around a closed system rather than flowing down the drain. Additionally, they provide constant and repeatable parameters such as flow rate, pressure and temperature. Although, chillers require an initial outlay, they can offer a short payback period. An independent case study conducted by Green Light Laboratories Ltd demonstrated that when continuous cooling was required for one condenser 24/7, a chiller pays for itself (with reduction in water costs) within just a few months.[1] The payback period was less than a year for those that required cooling for a large part of the day. Laboratories cooling more than one condenser (or more than one piece of equipment) would benefit from shorter payback periods.

Discuss your application requirements

It can be helpful to discuss your application requirements with a specialist provider, such as Julabo. They can carry out a full onsite assessment and advise on the right system for the best water savings-to-cost balance. With their wide product range, they are able to provide custom cooling water solutions—from a basic single application to a full laboratory solution with multiple connections. This can be achieved by using a single system or multiple systems depending on the size, scale and applications involved.

Julabo’s F Series chillers provide a simple environmentally-friendly alternative to cooling with tap water. Links are provided for further information.

View payback examples for F Series chillers.
View F Series product information.

Alternatively, if you would like to discuss your requirements or book an onsite assessment, please contact us: enquiries@medlinescientific.co.uk.


[1] Chillers versus Water: case study by Green Light Laboratories, 2018