Frequently Asked Questions – FAQ

HOW CAN YOU SAVE MONEY WITH COLLECTING WATER?

The average daily water consumption is 130 litres per person. At least 50% of the daily quantity used in households could be replaced by rainwater. This way, a 4 member household could save 95.000 litres of drinking water per year.

WHICH MATERIAL IS USED FOR WATER TANKS?

The tanks are made of polyethylene material, which is suitable for storing drinking water. The thickness of the tank wall is from 6 to 12 mm. Owing to excellent statics characteristics and wall thickness, the tank is resistant to the outdoor wear and tear caused by soil pressure and diverse weather conditions, and has a very long life cycle.

DO YOU HAVE HIGH GROUND WATER?

When the water tank is used on grounds with high levels of groundwater it should be fitted with steel clamps which are then anchored to a concrete surface.

IS THE TANK SUITABLE FOR DRINKING WATER?

According to the Maribor Institute of Public Health, the tank material is suitable for storing drinking water or edibles.
The tanks are made of original (non recycled) material. A polyethylene tank can be fully recycled.

HOW CAN WE CLOSE THE TANK?

A telescopic extension allows simple access to the filter and tank interior. Its adjustability allows adaptation of the tank’s height according to the trench depth.
The tank is closed with a plastic cover. If the tank is placed under the ground, it should be sealed with a cover that can hold a point source of presure up to 600 kg.

WHAT ARE THE BENEFITS OF USING RAINWATER TANKS?

  • Roto rainwater tanks are distinguished by requiring simple and efficient installation, maintenance and cleaning.
  • The use of these tanks will reduce the use of water from the water distribution system and consequently save costs in utility services up to 50€ per month.
  • By collecting rainwater you can contribute to the protection of the enviroment as the use of drinking water is reduced in this way. It also improves one’s water supply strategy and reduces one’s dependence on the water distirbution system. The tanks are designed mostly for domestic use in households that do not have their own water distribution connection.
  • Water supply – enables own water supply and helps with watering gardens in dry periods when it is prohibited to use the water distribution system for such purposes.
  • Soft water – rainwater is soft water, low in the calcium which causes limescale, and therefore very suitable for washing textiles.
  • Rainwater is better for garden wattering – rainwater is rich in nutrients and does not contain chlorine, which means it is more suitable for watering flowers and plants than regular watering from the distribution system.

HOW CAN WE SAVE UP TO 65 LITRES OF VALUABLE DRINKIN WATER PER DAY?

As many other things today, the use of water is affected by measures tailored to care for the environment and reduce costs. Over the years, the use of water has constantsly been on the increase. At the moment, the average daily water consumption is 130 litres per person, and that is mostly highly valuable drinking water! Only 2-3% of drinking water is used for coocking or drinking. When taking a bath, for instance, one uses three times the quantity of hot water as if taking a shower.

HOW MUCH DRINKING WATER CAN WE SAVE?

Europe is aboundandt in high-quality drinking water. However, in 98% of cases, our requirements could be covered by non-drinking water (e.g. toilet flushing, washing machines, watering of gardens and green surfaces, car washing, etc.). In a single day, one person could save up to 65 litres of valuable drinking water used for their water requirements just by replacing it with rainwater.

WHAT DOES WATER COLLECTION REQUIRE?

Water collection requires:

  • Water collection surface – a roof or natural well.
  • Collecting pipes (rain gutter)- rainwater is supplied from the roof through rain gutters and to the collecting pipe connected to the tank. The collecting pipe should be big enough to allow the collected water to run to the sand trap and the filter
  • A sand trap – to catch fine gravel, leaves and sand.
  • A supply pipe leading from the sand trap to the water tank
  • A filter – this dictates cost efficient maintenance, allows for a simple cleaning process with no side effects. Requires constant and intense maintenance to avoid great water loss. All water flowing from the roof to the tank should be filtered. No additional filtering is required after that.
  • A polyethylene tank – the tank can be fitted with a fine filter, a connection, spill-over system, vacuuming system and, if required, connection pipes that can be used on multiple tanks.

DID YOU KNOW?

Rainwater can be used for all household requirements except as drinking water or in food preparation. The above figures show that a household will normally use only 2% of drinking water for actual drinking or coocking, which means rainwater can be used for all other purposes. Rainwater can be used for gardening, laundry washing, dish washing, car washing, as toilet water, etc.

The average daily water consumption is 130 litres per person

HOW DO WE DETERMINE THE SIZE OF THE WATER TANK?

2000 L – 3000 L Gardening
5000 L Gardening + car washing + toilet water
8000 L Gardening + car washing + toilet water + washing machine
12 000 L Gardening + car washing + toilet water + washing machine + dishwasher
20 000 L Gardening + car washing + toilet water + washing machine + dishwasher + showers

WHAT ARE THE BENEFITS OF ROTO PURIFYING PLANTS?

  • Reliable functioning – no smells or malfunction.
  • 24h service – maintenance and servicing done by ROTO’s experts. We provide advice on suitable location, supervise the entrenchment, monitor out the start up, repair the purifying plant, etc.
  • Fast delivery – ROTO is a manufacturer, because of this purifying plant is manufactured and delivered in few days.
  • Easy to instal – the purifying plant can be installed in a few hours. A pit is dug, the treatment plant installed, the waste water inflow from the house is connected, the timer is connected to the tank and the computer is turned on. The burial instructions are enclosed.
  • Low operating expenses – the annually cost of the consumer electric energy amounts to only 6.1€ per person. This expense can be reduced by the installation of photovoltaic system.
  • High purification capacity – The ROTO purifying plant purify water up to 97.2%. Water purified by a treatment plant can be reused for watering of the garden.
  • Economy – Investment in purifying plant is repaid in period of five years
  • Long life – the purifying plant’s tank is made of polyethylene and has a life of 50 years.
  • 100% recyclable – after using it, the treatment plant may be dissembled and its polymer components may be recycled.

WHAT MEANS PE?

The size of purifying plant is determined by population units (PE) or equivalent users, while at the same time defining the biochemical capacity of the treatment plant. The PE unit signifies the specific consumtipon of water ranging from 0.15 to 0.20 m3/person/day and the ciochemical load of 0.06 kg BNO5/person/day. Only waste water coming from households and toilets without the inflow of rainwater can be led into the purifying plant.

HOW DOES WATER PURIFICATION PROCESS WORK?

The house purifying plant control is supervised by a computer built in a box or, for example, in basement of in the garage, next to the compressor. The computer contains set times for the functioning of individual phases.

The computer controls 4 valves, each with their own function:

  • Pumping water from the mud chamber to the aerator chamber.
  • Aeration in the aerator chamber.
  • Pumping the purified water from the small purifying plant into the outflow
  • Pumping the sedimental mud from the aerator chamber back to the mud chamber.

HOW GOOD IS THE WATER PURIFIED?

The ROTO purifying plants purify water up to 97.2%. The ROTO purifying plants operate safely and reliably, almost without making a noise and without unpleasant smell. Moreover, they are not sensitive to temperature fluctations in the environment. Waste water from toilets, bathrooms, kitchens and similar household sources of pollution are purified to such extent that water can safely be relesed into surface waters of underground streams.

USE OF PURIFYING PLANTS

Small purifying plants are used for the purification of waste water from toilets, bathrooms, kitchens and similar sources of pollution from houses and other residential facilities.

EU DIRECTIVE

According with the EU directive, every building must be connected to the sewage network system or provide its own treatment by year 2015. In cases where a connection to the sewage system is impossible or is to expensive, the most rational investment is to instal a purifying plant.

DETERMINING THE SIZE OF THE PURIFYING PLANT

The size of purifying plant is determined by population units (PU) or equivalent users, while at the same time defining the biochemical capacity of the treatment plant. The PU unit signifies the specific consumtipon of water ranging from 0.15 to 0.20 m3/person/day and the ciochemical load of 0.06 kg BNO5/person/day. Only waste water coming from households and toilets without the inflow of rainwater can be led into the purifying plant.

HOW GOOD IS THE PURIFICATION?

The ROTO purifying plants purify water up to 97.2%. The ROTO purifying plants operate safely and reliably, almost without making a noise and without unpleasant smell. Moreover, they are not sensitive to temperature fluctations in the environment. Waste water from toilets, bathrooms, kitchens and similar household sources of pollution are purified to such extent that water can safely be relesed into surface waters of underground streams.

WHAT ARE THE OPERATING COSTS?

Low operating costs, high level of economic and energy efficiency. The cost of the electric energy consumed by a ROTO purifying plant is annualy only 6.1€ per person ( 0.1 kWh per day per person).

REFERENCES

ROTO is a pioneer in the field of waste water treatment plant produsction in Slovenia and Europe. Our treatment plants are installed in 26 countries around the world. Over 20.000 ROTO purifying plant ranging from 3 to 500 units of various types have been installed. The product received the ZRMK Building and Civil Engineering Institute’s award, which is selected by experts in civil engineering, providing the product’s excellence.

WHAT IF SOMETHING DOESN’T WORK?

Quick supply, maintenance, startup and servicing performed by expert staff. Servicing by the ROTO company comprises the checking of mechanical parts in a plant, general cleaning services and operating situation control, as well as the testing of all functions performed by individual plant parts. The user is instructed on maintenance and the correct use of the treatment plant. We can also organise or supervise the installation and burial of the treatment plant into the ground.

WHAT IF THERE IS NO ONE HOME?

The bacteria survive for a few days even if there is no waste water inflow. The electronic equipment is installed into a special place in the house or in an external box.

WE HAVE MANY RAIN GUTTERS. HOW MANY SAND TRAPS DO WE NEED?

If we collect water from more than one rain gutter, we connect the existing rain gutters with one central sand trap and from there to the water tank. But in big buildings, we reccomend more than one sand trap.

WHEN DO WE NEED IT?

If we want to drive over the area where the water tank is, we need to replace the plastic cover with this cover.

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