[Claudio94]

Ciao a tutti, ho provato a cercare qualche informazione sui filtri d'amburgo ma non ho avuto molto successo...
Ciò che mi interessava era il rapporto di superficie filtrante in base ai litri dell'acquario e il flusso della pompa. La ricerca è andata un po' meglio dopo aver trovato questo sito particolarmente interessante (in inglese) che elenca i calcoli da effettuare per costruire un filtro proporzionato, ora vorrei chiedervi se sono giusti (o almeno si avvicinano a quelli giusti) oppure no.
Se avete qualche link da consigliarmi o qualche discussione del forum vi ringrazio anticipatamente !
Ecco il link del sito --> http://www.janrigter.nl/mattenfilter/
Questa è la parte "più" interessante, PURTROPPO PER VEDERE LE FORMULE BISOGNA ANDARE SUL SITO poichè nn me le copia

"Sizing a Mattenfilter

There is a direct relation between water flow, pump capacity and filter surface. A direct result of this is the time it takes to make a single pass through the filter. This time is also related to the thickness of the filter medium. Increasing thickness means more time required. With the Mattenfilter, it can safely be assumed that the actual oxidation takes place in the first one or two centimeters.
With filtration there is a direct relationship between velocity of water flow (surface area of filter mat) and pump capacity per hour. When sizing a pump and/or a filter mat, the pump is defined first. Twice the tank capacity per hour is a good average. It doesn't matter whether it is calculated with or without substrate thickness. I always use the nominal volume. For a 200 liter aquarium, the pump capacity should be around 400 ltr/h. Calculation is done with maximum pump capacity because there is little or no head involved.
Now that we have a pump capacity available, a desired velocity will result in the surface that is needed for the Mattenfilter. This is around 1000 cm2. But because a 200ltr aquarium has a side surface of 40x50cm=2000 cm2, this means that the actual water flow will be around 3 cm/minute. So a pump one size bigger should be selected for the job, even if this means that the water will flow at a faster rate than two tanks per hour. This is how you determine the correct combination of pump capacity and size of the filter mat.

The other method uses the available surface for filtration. Usually one of the sides of the aquarium is used and this means a fixed surface. Using the desired water flow through the medium then produces the required pump capacity. This will result in a certain number of tank volumes per hour filtered.

Calculations

Here are some formula's to do your own calculations:
A = surface filter mat
V = flow rate
Q = amount of water filtered
n = number of tanks filtered per hour


Flow rate in the filter:

This one is used to calculate the throughput velocity in the filter.
The factor thousand relates to the fact that 1 liter = 1000 cm3. This should be taken into account to remain constant in the formula.

By formulating it as follows:

the result is the required pump capacity, relating to the available filter surface and the desired flow rate. Divide by 1000, to go from cm^3 to liters. Multiply by 60 to get from ltr/minute to ltr/h.

The dwell time is then calculated by dividing the thickness of the mat by the throughput:


The required surface for the filter is a result of:

This formula enables you to calculate the size of the required mat with a given filter capacity and a desired flow rate.
Tanks per hour: 1-2 times the content of the aquarium should go through the filter. This value has proven to be a desirable one. When the flow goes below 1 tank per hour in an aerobic filter, a rise in ammonium is possible because bacterial reduction of waste is no longer 100%.

Flow rate: 5-10 cm/minute has shown to be an optimum throughput. It doesn't matter much if the actual value is 2 or 18 cm/minute. There are other parameters anyway that were not taken into account, causing a higher flow rate through the pores of the filter medium in reality. This is exactly the reason to keep the flow rate at a low level."

Qualcuno può aiutarmi ??