Hot Tub Filters
If the pump is the heart of the hot tub equipment system, then the filter is the kidney, and since there are no moving parts, it is the easiest
piece of equipment to maintain.
Filter Types
All hot tub filters are basically the same a
canister containing some type of filter
medium. This media strains impurities
out of the hot tub water as it passes
through. There are essentially three types
of filter media, but one is most commonly
used for hot tubs.
Cartridge Filters
As the name implies, the medium used in
this type of filter is a cartridge made
of fine-mesh, pleated fabric (usually
polyester). Figure 1 shows a cartridge
filter for a typical residential hot tub.
However, larger versions of this filter
can contain one or more cylindrical cartridges
to handle larger bodies of water.
Water enters the metal or fibreglass
filter canister and flows over the cartridge(s).
The extremely tight mesh of these fabric
strains impurities out of the water before
water is forced into the centre of the
cartridge, finally leaving the unit through
plumbing at the base.
 fig 1
|
1 |
Screen filter |
8 |
Base |
2 |
Air valve |
9 |
Drain plug |
3 |
Retainer assembly |
10 |
Clamp bolt assembly |
4 |
Brace |
11 |
Filter cartridge |
5 |
Housing |
12 |
Air bleed tube |
6 |
O-ring |
13 |
Air tube screen |
7 |
Clamp |
14 |
Pressure gauge |
Cartridge filters are classified
by square footage of filter surface.
By pleating the cartridge material,
a great deal of square footage can
fit into a very small package. Typically,
cartridge filters for residential
hot tubs range from 20 to 120 square
feet (2 to 12 square meters) in
a tank not more than 4 feet (1.2
meters) high by 1% feet (46 centimetres)
in diameter. |
|
