Sand Filter Pre-Coat

 Increases Filter Efficiency
 Contains No pH Upsetting Materials
 Polishes Water by Removing All Body Oils
 Eliminates Sand Channeling
 Safe & Easy to Use
 A Must for All Sand Filters

The oldest and most popular method of filtration is sand.  Sand filters share two things in common:

1) When in the filtration mode, water always flows from top to bottom;
2) They all have some sort of lateral or underdrain with slots to hold back sand while allowing clean, filtered water to pass through.

High-rate sand filters use a special filter sand, normally .45 to .55mm (also known as pool grade #20 silica sand), because it has sharp edges that serve to separate particles, allowing filtration to take place.  They operate on the basis of "depth" filtration; dirt is driven through the sand bed and trapped in the minute spaces between the particles of sand.  Initially, a clean sand bed will remove larger particles, and then, as the bed starts to load up with dirt, it will remove finer particles.

How "SAND-KOTE" Works
DAVIES "SAND-KOTE" precoats the sand bed, and removes smaller particles than can be removed by sand alone, including body oils.  DAVIES "SAND-KOTE" gives faster pool water clean-up after a shut down of pool. DAVIES "SAND-KOTE" backwashes out easily, and will not affect pH of pool water.
DAVIES "SAND-KOTE" does not affect the chemical balance of your pool or add anything to the water...it simply keeps it much cleaner and, at backwash time, can be readily flushed out prior to new application.
The addition of DAVIES "SAND-KOTE" does not require any special tools or modification to existing systems.  It is added to the filter through the skimmer.  Without DAVIES "SAND-KOTE" your filter is operating far below its potential capacity. Because DAVIES "SAND-KOTE" removes smaller particles than sand does alone, the first several times it is used, it will require backwash earlier than normal.  However, after this initial clean-up period, DAVIES "SAND-KOTE" will extend filter cycle, (time between filter backwash) by as much as 70%.  This precoat is removed (along with the filtered contaminants) with the backwash, and new DAVIES "SAND-KOTE" must be added--see chart below.

Filter Diameter                    12"    18"    24"    30"    36"
Level Cups "Sand-Kote"        1/2     1       2       3       4

Directions
DAVIES "SAND-KOTE" is added directly to the skimmer and forms a precoat on the filter sand that removes oil, contaminants, etc. before they contact the sand.  This pre-coat is removed (along with the filtered contaminants) with the backwash, and new DAVIES "SAND-KOTE" must be added - see chart above.  Because DAVIES "SAND-KOTE" removes smaller particles than sand does alone, the first several times it is used, it will require backwash earlier than normal.  However, after this initial clean-up period, DAVIES "SAND-KOTE" will extend filter cycle (time between filter backwash) by as much as 70%.