Technical Resources

We recommend that PURAIN filters be installed inside the tank if possible. If the entryway or some other factor does not allow this, then the tank can easily be mounted externally either underground or in a wall-mount. Many distributors deliver your storage tank already fitted with a PURAIN filter. HD Filters are designed for direct bury installation.

We offer PURAIN rain water filters in five sizes: 4", 6", 8", 12", and 16". Each size has a maximum flow rate that it can handle. The roof size range for each filter depends upon the rainfall intensity in the specific geography of the installation site. Click here to view the color coded sizing guide Use our color coded chart for filter sizing in a wide range of US locations. If you do not see a location close to you, please contact Ecovie and we will add you location to the chart!

The PURAIN rainwater filter works with the minimum possible height offset between the inflow and outflow. A height offset is a prerequisite for a self-cleaning filter in order to ensure proper operation. Since 1993, INTEWA has tested different types of self-cleaning filters – none of which captures as much water as PURAIN. Alternatively, a basket filter may be used in place of a PURAIN jump filter in order to capture 100% of rainfall and have zero elevation offset; however, they have to be cleaned out regularly regularly and do not guarantee the water quality. PURAIN filters normally require zero maintenance and yield high water quality.

The water filtered by the PURAIN hydraulic jump filter is perfectly suited for use in toilets, washing machines, and even drinking water. It should be noted that the quality of water also depends on the storage of the rainwater. Factors such as temperature of the storage tank, calming inlet, overflow skimmer, size of tank, and post treatment are also critical for an optimum quality of water.

The PURAIN-filter is extremely low maintenance and in most cases zero maintenance. Dirt and leaves in the sedimentation chamber do not need to be removed because they will be flushed away with the next heavy rainfall. If the filter screen does become clogged, it is easily cleaned through the tank lid. Alternatively, in extremely rare cases, the screen can be removed for cleaning. If the filter is used for greywater applications in a AQUALOOP system, then a cleaning shower is recommended to prevent build of biofilm which can clog the filter. By showering the screen periodically, the filter screen stays clean and maintenance free. We recommend that you check your filter about twice a year.

In small to medium rainfalls collection efficiency is 100 %. It turns out that almost all rain that falls, regardless of geography, is at these lower flow rates. We typically size for hydraulic jump to occur at a rainfall rate of about 1" per hour flow rate. Above this flow rate, the filter is vigorously cleaned and there will be some water flushed out to drain. Overall, capture efficiency is a maximum for a self-cleaning filter in any given geography and roof size.

The non-return valve and overflow skimmer, made from injection molded parts, are separately installed in the tank along with the bigger PURAIN rainwater filters, 8" to 16".

The RAINMASTER Favorit water supply unit, in addition to the pump, contains a built-in air gap back-flow prevention for mains water back-up. In other systems, this must be installed separately. This allows the system to continuously operate on mains water, even when there is a rainwater or greywater shortage.

Ecovie offers the RAINMASTER Favorit water supply unit with speed control (VFD). The speed unit offers great advantages for the user in better pressure control and energy savings. The RAINMASTER FAVORIT SC speed controller can save up to 40% on power costs and dramatically increase the operational life of the system.

We generally recommend the installation of a small expansion tank of at least 2 gallons. The expansion tank prevents water hammer, increases the service life of system components and minimizes frequent pump start-ups should leaks occur. It is especially important in the case of toilet flushing applications.

No, RAINMASTER FAVORIT SC multi-pump systems are usually far cheaper than conventional multi-pump systems. This is made possible by economies of scale in production. Only the RAINMASTER Favorit SC water supply unit allows real redundancy and thus the highest possible operational reliability with its duplex and triplex configurations. The Bluetooth connectivity and pre-programming makes installation truly "plug and play."

The RAINMASTER Eco is designed and optimized for use in single-family dwellings. It is ideal for supplying toilets and laundry efficiently with rainwater or mains water up to the second floor. Additionally, the Eco can be used for garden watering with a hose and for pressure washers. In cases with automatic irrigation or showers in larger applications with more fixtures, the Rainmaster FAVORIT is recommended to meet those flow and pressure requirements.

Many rainwater systems are getting old and customers want to exchange the old pumps or rainwater units with updated devices. The Rainmaster Eco is perfectly suitable for this since it comes already supplied with flexible connections. An existing suction line with a 1" connection size and the float switch from old device can be re-used if these are 100% water-tight and not worn out.

The whisper-quiet RAINMASTER Eco at around 48 dB(A) can be easily used for hose watering and single sprinklers. For larger automatic irrigation systems we recommend the use of RAINMASTER FAVORIT.

There are a multitude of benefits with the RAINMASTER Eco diaphragm pump such as 75% less energy consumption, 50% less background noise, a suction length of up to 40 m, which is almost 3 times that of a conventional centrifugal pump. (Note: The RAINMASTER Eco 10 is whisper-quiet at around just 48 dB(A)). The Eco runs on low voltage power and is compatible with DC current which means it would work with solar panels.

INTEWA always thinks one step ahead!

The innovative INTEWA RAINMASTER Eco concept requires less installation space, less material and therefore faster production. These savings are passed on to our customers so that we can offer better price-performance value than other manufacturers.

With the tank level indicator, you can be comfortable with the knowledge your cistern water level is always in view. By being able to monitor the water level in your cistern, you can make decisions on whether the water level is sufficient for additional uses such as watering the garden, filling a pond or if an extra car wash is called for.

The RAINMASTER Eco, as its name suggests, was developed for rainwater harvesting, but can be also be used for numerous other water applications. It is particularly useful in conjunction with home AQUALOOP greywater systems for toilet flushing and laundry. It may also supply well water (up to a 9 foot intake level), treated wastewater, water from streams and ponds. Should water from the natural/treated source run short, the unit automatically switches over to an approved air gap backflow mains water supply, so household water needs are always covered.

You can contact us to info@ecoviewater.com and we will process the purchase at Ecovie Water management. You can also buy some of the components on our Amazon store.

Plurafit is suitable as rainwater filter for simple applications.For a self-cleaning filter, see the PURAIN 4" pre-filter.