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GRANDER® Heats Kindergarten in Oberpullendorf

Heating water with drinking water quality

The parish kindergarten in Oberpullendorf, having relied on GRANDER® water revitalization for many years now, reports: thanks to GRANDER®, the heating water has been crystal clear and has met drinking water quality requirements since 2004!

The conditions in heating systems put a strain on the water used in them, and this is particularly true for floor heating systems. Slimy deposits often accumulate in the loops installed in the floor or the walls. What is more, the water is rarely heated above 40 °C in such systems. These are perfect conditions for bacteria to thrive: heating water turns murky and foul-smelling and accumulations reduce the throughput of the pipes. As a result, heat emission is reduced and in extreme cases the whole heating system can break down.

To protect the facilities, save energy, and improve the room climate, the heating system of the Oberpullendorf kindergarten was fitted with a GRANDER® unit in 2004.

An analysis of the heating water more than fifteen years after the installation revealed that the heating water is still crystal clear and has drinking water quality!

 

Ever since the installation of a GRANDER® Circulation Unit in the kindergarten’s heating system, the heating water has been closely monitored. The various analyses conducted show that all chemical and chemical-physical parameters checked not only satisfy the requirements of the ÖNORM H 5195–1 standard of the Austrian Standards Institute, they also meet the quality standards set by the Austrian Drinking Water Regulation.

The GRANDER® Inline Unit restores the transport capacity, vitality, and self-cleaning properties to the heating water. Having regained its natural power to self-clean, the dirty and often foul-smelling heating water turns clear and mostly odorless in a matter of only a few months. This not only results in cost savings but also prompts a palpable and positive change in the heated rooms.

There are few areas where the GRANDER® effect shows as clearly as in heating water. The samples taken from the Oberpullendorf kindergarten’s heating system prove that GRANDER® starts paying off from the moment it is installed:

  • Makes for clean and oderless heating water
  • Lowers risk of silt deposits as biofilm formation is considerably reduced
  • Reduces susceptibility to microbial contamination and corrosion
  • Lowers susceptibility to deposit formation: improves throughput of heating pipes and radiators as well as the piping of floor and wall heating systems
  • Saves energy
  • Increases heating efficiency
  • Creates a pleasant room climate
  • Optimizes operating and maintenance costs

 

The chemical, physical, and bacteriological lab analyses produced the following results:

Chemical analysis

Measured value
No. 272/2009

Measured value
No. 66/2014

Measured value
No. 252/2015

Measured value
No. 50/2017

Threshold*

Threshold drinking water

Total hardness                                               °d       

15.5

15.5

17.6

16.4

Total hardness threshold*


9.5

Calcium                                    Ca                 [mg/l]

75.5

79.8

79.2

81.9

--

400

Magnesium                              Mg                 [mg/l]

21.2

18.7

28.9

21.4

--

120

Ammonium                              NH4+                       [mg/l]

<0.02

<0.02

0.060

0.027

--

0.5

Nitrate                                      NO3-                        [mg/l]

<1

<1

NA

NA

--

50

Chloride                                   Cl-                  [mg/l]

9.96

8.97

8.57

8.05

<30

200

Orthophosphate                       PO4-P            [mg/l]

<0.05

<0.05

<0.05

NA

--

--

Sulfate                                      SO4-2                      [mg/l]

43.0

NA

33.3

NA

--

250

Total Iron                                 Fe                 [mg/l]

0.040

0.075

0.083

0.026

--

--

Dissolved Iron                          Fe                 [mg/l]

0.041

0.030

0.022

0.011

0.2

0.2

Chemical analysis

Measured value
No. 82b/2020
HEATING WATER

Measured value
No. 83/2020
DRINKING WATER

Threshold*

Threshold drinking water

Total hardness                                               °d       

14.1

13.5

Total hardness threshold*


9.5

Calcium                                    Ca                 [mg/l]

70.8

63.9

--

400

Magnesium                              Mg                 [mg/l]

18.1

19.6

--

120

Ammonium                              NH4+                       [mg/l]

<0.02

<0.02

--

0.5

Chloride                                   Cl-                  [mg/l]

10.0

21.3

<30

200

Orthophosphate                       PO4-P            [mg/l]

 

<0.05

--

--

Total Iron                                 Fe                 [mg/l]

0.159

0.070

--

--

Dissolved Iron                          Fe                 [mg/l]

0.099

0.006

0.2

0.2

*

Water quantity

Total earth alkaline metals1

German degrees2

up to 1.000 l

up to 3 mmol l-1

up to 17

1,000 to 5,000 l

up to 1 mmol l -1

up to   6

more than 5,000 l

up to 0.1 mmol l-1

up to 0.5

1) The total of alkaline earth metals is given in mmol l-1 according to the International System of Units (SI).

2) German degrees are no longer in use and only stated for the reader’s convenience.

 

Physical analysis

Measured value
No. 272/2009

Measured value
No. 66/2014

Measured value
No. 252/2015

Measured value
No. 50/2017

Threshold*

Threshold drinking water

pH value  a (facilities without aluminium materials)

                b (facilities with aluminium materials)

7.28

7.74

7.62

7.78

a) pH 8-9.5

b) pH 8-8.5

6.5-9.5

Electrical conductivity                       [µS/cm]

518

512

518

503

 

2,500

Colour (SAK at 436 nm)                   [m-1]

ND

ND

0.00173

0.00359

 

0.5

Acid capacity up to pH 4.3                [mmol/l]

3.98

3.84

4.05

3.62

 

--

Physical analysis

Measured value
No. 82b/2020
HEATING WATER

Measured value
No. 83/2020
DRINKING WATER

Threshold*

Threshold drinking water

pH value  a (facilities without aluminium materials)

                b (facilities with aluminium materials)

7.35

7.28

a) pH 8-9.5

b) pH 8-8.5

6.5-9.5

Electrical conductivity                       [µS/cm]

518

505

 

2,500

Colour (SAK at 436 nm)                   [m-1]

ND

ND

 

0.5

Acid capacity up to pH 4.3                [mmol/l]

4.33

3.55

 

--

 

Bacteriological analysis

Measured value
No. 272/2009

Measured value
No. 66/2014

Measured value
No. 252/2015

Measured value
No. 50/2017

Threshold drinking water

CFU 22° C, 72 hrs, ISO 6222                    [KBE/ml]

2

0

2

0

100

E. Coli, 37°C, 72 hrs.                       [KBE in 100 ml]

0

0

ND

ND

0

Coliform bacteria 37°C, 72 hrs.   [KBE in 100 ml]

0

0

ND

ND

0

 

Bacteriological analysis

Measured value
No. 82b/2020
HEATING WATER

Measured Value
No. 83/2020
DRINKING WATER

Threshold drinking water

CFU 22° C, 72 Std, ISO 6222                    [KBE/ml]

43

10

100

  

  * according to the Austrian H 5195-1/2 heating water standard

 Examined on: October 13, 2009, May 7, 2014, November 25, 2015, April 25, 2017, July 16, 2020

 

The heating water’s restored vitality ensures that the children and staff at the Oberpullendorf parish kindergarten enjoy a pleasant room climate. Also the kindergarten’s drinking water is revitalized. The children’s opinion on the revitalized water they drink every day? They all agree: “Yummy!”

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