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How to filter
rainwater?
When rain falls, the water is loaded with various impurities: dust, waste (organic or otherwise), micro-organisms... Atmospheric pollution also causes a drop in its pH, making the rain sometimes very acidic.
Taking all these factors into account, it's easy to see that using rainwater is not that simple. It's difficult to connect your tank directly to your water network without prior treatment and filtration. Find out more about the solutions available to you, and how LM Innovation technology improves the quality of harvested rainwater.
Rainwater harvesting
Using rainwater for professional purposes is more complex than for a private individual who just wants to water his garden. Such an installation requires a great deal of thought.
Anticipate the amount of water collected
Before installing a rainwater harvesting system, it's essential to know how much water you can collect. This is based on the size of your roof.
Once you've made your estimate, you'll be able to choose the right size tank. You'll also be able to judge how this water will beused. Will the quantity recovered be enough to water some of your plants? All your plants? Or to clean all your surfaces? Anticipating the use of harvested rainwater is important for the future, as this decision will determine the installation of a specific water network.
The roof: the best rainwater collector
To capture rainwater properly, the roof must be sloped. A flat roof will tend to mix water with the organic matter that accumulates there because it can't be properly evacuated.
It's also preferable for the roof to be made of slate or tiles, to avoid polluting the water with synthetic materials. It is obviously forbidden to use rainwater collected on a roof containingasbestos or lead.
Storing water in a cistern
The roof is connected to the collector via the gutters. Overhead or underground, the latter takes the form of a cistern. Stagnant water, even in a cistern, cannot be stored for long periods without deteriorating in quality.
By mixing LM water with your rainwater, you can store it for several months.
Filtering and using rainwater
Filtering leaves on the roof
The first stage is on your roof, in your gutter, where organic debris such as leaves that fall onto the roof are retained. This first level of filtration consists of installing small grids along the gutters. However, this recovery system requires the grids to be unclogged from time to time.
Filter leaves before vatting
Can't access your roof? There's another way to filter out organic debris. Before the water enters the cistern, we place a leaf filter, or primary filter. It collects tree leaves and large impurities. It also prevents small animals (mice, frogs, etc.) from falling into the cistern.
Filter out small particles
For an even higher level of filtration , a 20-micron filter can be installed to remove particles suspended in the water. But without affecting micro-organisms or chemical pollution in the water. This level of filtration means that the water can be used for washing the floor, or for domestic use, in the toilet.
Using rainwater
After filtering rainwater in the gutters or before the tank, you need to pump it into your water system. For watering: no additional filtration level is required. The primary filter is all you need. The pump sends the water directly to your sprinkler system. Just make sure it sucks up the surface water rather than the water at the bottom of the tank, where impurities are deposited.
Please note: it is strictly forbidden to use rainwater for dishwashing, cooking, cleaning (other than the floor) or washing. Regardless of the filtration system used, rainwater is considered non-potable in France. It is therefore forbidden for human consumption.
