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Kết quả (Anh) 1:

I have just resigned

Kết quả (Anh) 2:

Example. In order to calculate the filter in an installation we need to
know the flow of the water to be recirculated (to be filtered) and the filter
speed. In our example pool, we have a flow rate of 13.5m³/h, whilst the
filtration speed will be 50m³/h.m² (or 50m/h) maximum, as it is a
residential pool. Applying the corresponding formula we get the
necessary filtration surface area:
2
3 2
3
0,27
50
13,5 S m
m h m
S m
Vf
S Q ⇒ =
×
= ⇒ =
To select a vertical sand filter we need to know the diameter of the filter
in millimetres. In this case, the filtration surface area will correspond to
the cylindrical part of the filter, which is no more than a circumference.
Then, to find the diameter, first we apply the area of the circumference
formula (S= π r2) and we obtain the radius in metres, which we multiply
by 2, as the diameter is 2 times the radius. Finally, we get the value in
millimetres, multiplying the result by 1000.

Kết quả (Anh) 3:

我刚申请辞职。