Hayward HCF Series Installation And Operation Manual page 4

Commercial sand filters

Installation and operation manual (36 pages)

Table of Contents

Available languages

NOTICE – Standards for public and private pools vary by jurisdiction. It is the responsibility of the installer to be aware of these codes before designing,

specifying or installing any piece of equipment for a swimming pool or spa.

Swimming Pool Filters

Filters are, without a doubt, the most important accessory used in the treatment of swim-

ming pool water. Their purpose is to eliminate suspended particles from the circulating

water, thus clarifying the water. The principle operation consists of passing the swimming

pool water through a bed of sand which will retain any particles that are suspended in

the water.

It should be kept in mind that the filtration system consists of a number of elements,

such as metering equipment, pumps, pool shell fittings and pipe work, which ensure

the correct suction and return flows that will affect the resultant condition of the treated

water.

The quality of filtration depends on various factors, the size and shape of the sand, the

sand bed depth, characteristics of the sand such as granular size, density, etc. A most

important parameter is the water filtration rate. Other factors affecting the selection of

a filter are the materials used for its construction, the working temperature, and the

operating pressure.

Hayward

filters are manufactured from proprietary resins and fiberglass, they are virtu-

ally corrosion-proof. The internal fittings (diffuser and lateral system) are manufactured

from PVC and ABS. They are unaffected by salt water and are manufactured for a working pressure up to 50 PSI and a maximum working temperature

of 104º F.

Filter Characteristics

Choose the filter or filters that meet the local turnover time requirements. Remember it is possible to add filters together to obtain the correct amount

of filtration area required. Note: when using multiple filters, they must be plumbed in parallel configuration. It is also a good idea to oversize the surface

area required by 10% or more, this will allow for better water quality. When possible, use more than one filter in conjunction, this will allow one filter to

be serviced while one is still functioning.

When sizing the plumbing for a filtration package be sure to keep in mind that the velocity of the water in the pipes is very important. Each country or

state may have different maximums for velocity in the plumbing. The recommendations of APSP-7 should be followed.

Installation Characteristics

To ensure selection of the correct pump size, the required flow must be obtained by taking the system head into consideration. The system head is the

added difficulty to move water through the system presented by using, elbows, piping, tees, changes in elevation, etc.

It is also recommended that the discharge from each pump is brought together in a single manifold to the filters. This will allow for greater flow rates for

the backwash cycle.

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Install a check valve ahead of filter inlet to prevent contaminants from draining back into the pool.

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Install a check valve between filter and heater to prevent hot water from backing up into filter and damaging internal components.

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Disposal of "waste water" must meet local, state and national codes.

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See Chart on page 4 for vertical and horizontal clearance.

General

Hayward Recommended Minimum Filter Piping

Filter Model