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What is the difference between Demin and RO water.

There isn’t much difference between demin and RO water, RO water is produced by forcing the water through a semi-permeable membrane while demin water is produced by using ion exchange resins.

The quality of water produced from both of these plants is depending on the incoming raw water. We can produce various qualities of water by either putting in a double pass system on an RO, adding a CEDI unit or further polishing for RO or demin.

Accurately sizing a water softening plant is essential to ensure it operates efficiently and optimises the plants performance. The incoming water hardness must be measured to ensure the softening plant has the correct capacity to reduce salt usage. We will specify the right size plant for your needs.

The water softening plant resin expands and contracts when it is exchanging ions and eventually the resin becomes exhausted and needs to be regenerated with a brine solution.

The water softening plant does this automatically but after a period of time, for example 3 years or constant use, the resin starts to deteriorate and is not longer as effective and needs replacing.

The conductivity of the water is effected by a number of factors, temperature has approximately a 3% flux differential on the conductivity. For example if the water temperature has increased by 2 degree C the water becomes less viscous therefore passing through the membrane at a faster rate which reduces the cross flow on the membrane and can cause the conductivity to go up, the same is the case in reverse a decrease in temperature can mean that the water goes through slower which can result in a decrease in conductivity but a reduction in flow rate.


The volume of water that goes to drain depends on the size of the plant. Water softening plants and demin plant are normally sized to regenerate once a day and use less water that you think. An RO will reject a percentage of water produced but in many cases this reject water can be used elsewhere on site for washdown water.


Do you offer regular service contracts with planned preventative maintainance?

Yes, we offer various levels of service contracts depending on need, we put together a service schedule which is agreed with the customer at the start of the contract.

The time it takes to carry out each service varies depending on the size and the critical nature of the system and how much testing or calibration that is being carried out.

Our standard breakdown response time is 48 hours for existing customers on a service contract but we can offer much shorter response times and are flexible to the customers needs and requirements.

The reason we need a service agreement is to guarantee a level of service and commitment between our company and yours as a customer and does include all of the below.

  1. Reduced call out fees and service price.
  2. 48 hour response and telephone support prior.
  3. Priority for breakdowns.
  4. We hold the price of the service for the year of the agreement.
  5. Our best price guarantee for existing customers.

Most monitoring equipment such as pH and conductivity should be calibrated at least every 6 months or when something has principally changed depending on usage.


How do water softening plants work?

A water softening plant works by ion exchange, as the water passes through the resin bed the ions of calcium and magnesium are exchanged for sodium ions, the plant is fully automatic and is controlled by a valve, the only thing that you need to do is top the salt level up at regular intervals.

We do not recommend that you drink softened water, this is because the water from a water softening plant is has a slightly higher sodium content and is not good for young children or people on a low sodium diet. If a softening plant is being used for drinking water we can fit a blend valve into the system to reduce the level of sodium but it should not be the main source of drinking water.

We would not recommend that you drink RO water as it reduces the pH slightly and as RO water is so pure it doesn’t have the vitamins and minerals in the water that is essential for your body’s health and wellbeing. If the water has to be treated with RO and is going to be used for drinking we would recommend putting in a remineralising plant or installing a Nano Filtration unit.

A low pressure alarm on the RO can often be an indication that the filter needs changing, a carbon filter is required on the feed to an RO unit to remove chlorine which can damage the membrane. Filters can get blocked by dirt and sediment in the water and sometimes need changing in between service visits. Alternatively it could be an issue with the incoming supply or a pressure switch, if you contact us we are often able to help resolve the issue over the phone and negate the need for a site visit.

Water treatment can improve manufacturing processes by ensuring that you have a consistent quality of water. Water that comes from the mains is safe to drink but often has particles and contaminants in that can cause issues in production. Talk to us about your needs and we will find the right system for you.

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