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Characteristics and functions of the filter granules

The Aquaviva filtration granules are not just some crushed porous volcanic rocks. We have tested various different granules, including Australian Zeolite which we found unsuitable because of its hardness and non porousity.  The granules are specially imported from Europe, LAB tested and guarantee the best possible breeding ground for the micro biology to grow, as of their chemical composition.

The filter granules demonstrate a high ion exchange capability for ammonia ions as well as an exceptionally porous structure (see photo).

Therefore they are suitable for absorbing dissolved nutrients and especially as locations for micro-organisms. As filter material and also as a major part of the water plant substrate, the granules fulfil the following functions:

The filter granules draw ammonia ions from the water and release mainly calcium and potassium ions. As a result, there is strong development of aerobic micro-organisms   on the surface and in the interstices between the granules (= natural pool biology). These control the presence of organic contaminants (mineralising/stabilising). Nitrogen will also be reduced through nitrification/denitrification and the biological localisation of phosphates promoted.

These functions will prevent an excess of dissolved nutrients (especially nitrogen and phosphates) and algae will be extracted from the solution. At the same time, the  granules function as ideal storage sites for nutrients to supply the water plants. In overview, the products offer the following specific functions:


The granule surface taken by electron microscope with 10,000x magnification.

The exceptionally porous structure, full of cavities, with cavity diameter typically
less than 1 micron, can be seen.

Product type



Filter granules
(2 - 5 mm)

Ion exchange and carrier for nutrient absorbing micro organisms

Quantity is determined  individually for the necessary cleaning  performance

Plant granules F
(0,6 - 2 mm)

Ion exchange and nutrient storage in the  plant substrate

2 kg per plant

Cover granules(16 - 32 mm)

Absorption of dissolved ammonia from the substrate; inhibition of thread algae

3 cm cover above the plant substrate and filter zone

Technical product data

The Aquaviva-Principle filter granules are natural stone granules, with the facility for ion exchange and with high macro and micro porosity. In filter and trickle filter technology they are especially suitable as substrate for the development and fixing of the microbiology to limit and control nutrients. They are used as nutrient controlling and reliable plant substrate in aquaria, pools and base filters based on vegetation.

Chemical Analysis:


68,40 %


12,00 %


4,10 %


2,10 %


0,44 %


1,30 %


1,10 %


0,20 %


0,16 %

Evaporation loss

10,20 %


100,00 %

  Grain sizes and packed density

Filter granules L

2 - 5 mm

860 g/l

Plant granules S

0,6 - 2 mm

810 g/l

Plant granules

0 - 5 mm

1140 g/l

Cover granules

16 - 32 mm

880 g/l


0 - 0,1 mm

720 g/l



2,0 g/cm3

Specific surface area(BET)

29m2 /g

Moisture content

Max. 7 %

NH4+ Ion exchange capacity:


Volume of stone spores with diameter 5-10 my:

0,14 cm3/g


Exchangeable ions:


48,10 mg/100 g


14,86 mg/100 g


4,90 mg/100 g


3,45 mg/100 g


Water conduction:


0,6 - 2 mm

10 m/h


2 - 5 mm

40 m/h


5 - 8 mm

96 m/h


nominal values for application use

The following nominal and performance data was established by introducing Aqua-Superton Filter granules 0,63 - 2 mm as the working substance of a water filtering bio filter under controlled technical parameters

Water throughput relative to days in service

(lost the diagram – the x axis legend reads ‚days in service’

Capacity to reduce N O3 within a working period of 90 days: 1-22 mg/h kg

Biological capacity to reduce PO4  relative to days of service

y axis legend: PO4 reduction:  x axis legend: days of service




Technical data – pre-prepared pool granules

 The pre-prepared pool granules form a planting compost for water plants, with main components being cattle dung (well rotted and odour –free), zeolite, lava and clay. It supplies water plants with all he necessary nutrients in slow-release form. It showed excellent results over a three-year test at LWG in Veitshochheim., Austria.

 Technical product data


Total nitrogen

50 - 150 mg/l

Phosphorous (P2O5)

50 - 150 mg/l

Potassium (K2O)

150 - 300 mg/l

Salt content

max. 1,5 g/l

pH value

6,0 - 7,0

Dry weight

65 - 75 %


ca. 700 g/l


 Technical application test results

The diagrams which follow show results from an extensive series of pool tests carried out at LWG in Veitshochheim with different substrates, including both sand and pre-prepared pool granules, and their effects on water plants and the growth of algae. (Fertigteichgrund = plant compound)

The following plants were planted: Juncus effusus, Iris pseudacorus, Typha laxmannii und Myriophyllum verticillatum







Filter granules (Filter zone)

Plant granules, pre-prepared granules and coco flex husks

Pump technology(P)
Skimmer (S)
distribution unit (V)

Anti-Algae powder

Cover granules

Fast and controlled development of a long term active and stable pool biology

Encourages healthy and fast water plant growth

Purposeful cleaning of the water surface; extraction of macroscopic algae (P,S)

Fast removal of acute levels of algae in suspension and in strings by neutralising ammonia

Inhibits macroscopic algae in the shallow areas and the water lily zones

Permanent extraction of organic and dissolved contaminants

High capacity to absorb nutrients; also acts as a nutrient source

Optional base cleaner; silt trap which can be emptied by suction (P,S,V)

Promotion of mineralising and stabilising the biomass at the base of the pond

attractive cover material

Defined absorption of phosphates

Optimal conductance and aeration

Controlled flow and distribution of water in the  filter zone (V,P)

Increased effectiveness when introduced simultaneously with freeze dried micro organisms


Deterrence of the development of suspended algae and unclear water

Control of  pH-value

Skimmer installed above the pool cover; Skimmer-level adjustable (S)



Control of biological pH-value


Optimal aeration of the filter zone biology (S,V)



Impedes the development of macroscopic algae on the layers and in the shallow areas


Low assembly and installation cost (P,S,V)