This only happens if you have screwed the ceramic filter too tightly.

In the worst case, not only will cracks appear in the glass, but the water can also enter the lower tank unfiltered, as the silicone rings are squeezed so that water can pass through. 

Please keep this in mind for the future. Of course, this also applies to the silicone rings on the tap.

This can have two causes:
Either your ceramic filter is dirty or the unit has created a vacuum.
If the ceramic filter is dirty, clean it with a pot cleaner (made of foam with strong abrasive fleece) under running water until it is white again.
Do not exert too much pressure when cleaning, as the ceramic wall is only 1 cm thick. It can break. You should replace the ceramic filter after two years.
If your filter has created a vacuum, lift up the intermediate ring and clean it and the glass edge with a clean (dry!) cloth.
Condensation / air humidity can create a vacuum in rare cases.

Green discolouration in the filter indicates that algae have developed.
Algae need sunlight for their growth.
We have particularly pointed out in the operating, assembly and maintenance instructions that the water filter must not be exposed to direct sunlight under any circumstances - and to no sun reflection (e.g. reflection by window panes), as algae can otherwise form.
If this has happened, you can clean all parts of the filter that show a green discolouration with a salt water solution (approx. 1 SL salt for 1 litre of water). The mineral basket / ring, the stones and crystals, can also be swung out or cleaned in this salt water solution.
Unfortunately this is not possible with the cartridge.
Algae are not necessarily harmful. However, if the taste of the water should change, you may need to replace the cartridge.
For the future, we recommend placing the water filter in a darker location. If this is not possible, you can cover the filter with a cloth, for example.

First of all we can reassure you, because the water is still harmless.
Apparently there are still residues in the filter, which are gradually released and thus make the water appear cloudy.
In DIN EN 27027 it says:
"Turbidity is defined as a reduction in the transparency of a liquid caused by the presence of undissolved substances.
The undissolved substances scatter incident light and the liquid loses its transparency. It appears milky or cloudy.
Of course, no one likes to drink cloudy water, so we recommend a run with cold water.
In other words, the way you did it the first time you got the filter.
You will probably already see how the substances are "washed out".

Our limescale filter pads verifiably remove limescale from tap water and make it softer in taste.
It should also be mentioned that there are no limescale filters in this sense. There are dirt filters for solids, but the lime in the water is not a solid but dissolved ions. These go through every sieve.
If you choose an undercounter filter, our Aqua Avanti filters offer a very high limescale-reducing conversion of the water through ion exchangers. The catalyzer granulate that flows through works according to the seed crystal principle. Precipitated lime is bound to the seed crystals and floats away in the water. The lime is therefore still present, but no longer adheres to glasses, pots, kettles, etc.

Through the chemical reaction of magnesium oxide from the alkaline filter stage and water, the water can become white, flakes. This is completely harmless to health.
However, if you want your water to be clear, you should let an upper tank of 3 litres of water, plus 2 tablespoons of citric acid, pass through the cartridge. Citric acid is available at the pharmacy, the drugstore or from us.
Then, to neutralize the taste, run clear water through the cartridge 1-2 more times.

The "crystals" are silicon. This takes over the function of the course of the stream, as in nature, because through this the water gets back its natural structure, as well as its natural taste. You can continue to drink the water without any danger, because the colloidal traces are not harmful, but even valuable for our physical mineral balance (e.g. for bone formation).

Vor der Verwendung von Kalkfilterpads müssen Sie diese ca. 5 Minuten in Wasser einweichen, damit der Inhalt komplett nass wird.

Wenn nicht, macht entsteht ein Druck und Wasser kann nicht durch den Filter.

Der Trick ist daher, den Pad vor der Nutzung erst einmal "einzuweichen" und dann feucht in Ihr Filtersystem einzusetzen.

Taste is always subjective, so this is not a deficiency!
Often people who have not used filtered water before or have enriched it with stones feel that water tastes extremely stony / metallic. What you taste are the minerals (salts).
In order to remedy this, it can be helpful to rinse the stones/ the mineral ring once again and put them into the filtered water.
If you still don't like the taste, remove the stones/ring and simply use your water filter without these accessories.

Taste is subjective and there is no lack of it!
For the production of the filters we use harmless ABS (more information HERE).
For hygienic reasons, we expressly point out that the parts should be rinsed before use - with clean, disinfected hands - and only then put together.
It is also essential to pass several litres of water through the filter as indicated in the instructions.
If the taste still seems "artificial" to you, continue to run water and/or rinse the plastic parts, e.g. with a mixture of citric acid.

We do not know how you measured the water and with which test device.
An institute commissioned by us has looked into the question why the same water has different PH values.
Director Plank of the AIT in Austria said that it is because of the devices and the test strips that the results vary.
This institute states that to avoid false results, they only had to use very high quality and expensive equipment.
In the link the filter performance (only german version):                                                                                  

http://yve-bio.com/mediafiles/Sonstiges/labortests/Test%20YVE-BIO®%205-step%20cartridge_2016.pdf

The PPM value in our filters says nothing about the contamination and cleaning.
Because in our filters nitrates, heavy metals, germs, bacteria and coarse-material medicines are bound and filtered out in the cartridge and the ceramic filter.
The PPM value says something about the mineral content in the outgoing water.
See our latest test:
 http://yve-bio.com/mediafiles/Sonstiges/labortests/Test%20YVE-BIO®%205-step%20cartridge_2016.pdf
Osmose filters filter everything out, so that the PPM value is then at zero.
Osmosis filters produce soft water with a hardness of zero, since reverse osmosis removes all calcium and magnesium ions.
Osmosis water is completely free of minerals. It therefore does not dissolve any waste products from the human body, but mainly minerals.
However, minerals are essential for the human body and almost all people suffer from a chronic mineral deficiency due to insufficient nutrition.
The claims about the influence of conductivity on the osmotic gradient cannot be physically proven at present.
In high quantities (from around 17 litres), osmotic water has a toxic effect on the human body. At this quantity, so much sodium is flushed out of the body that an acute threat to life is given.
What leads to massive health problems in high quantities can have no health-promoting effect even in small doses. In addition, the consumption of acid - and this is osmosis water, because pH remains pH - is certainly not beneficial to the human body.
We depend on a sufficient supply of mineralised water to maintain our acid-base balance in the body and to buffer acids effectively. This is the only way to prevent the body from over-acidification.
The supply of 2 litres of acid per day has the opposite effect. And with already small amounts of minerals, a washout in the long run is in any case to be classified as precarious.
Moreover, osmosis water is not a natural product, but a technical product. However, our body is adapted to the consumption of naturally occurring water - otherwise we could not have survived for 200,000 years.