plumbing fitting in the shape of a "T" used to connect pipes.
TELEPOLE A long-handled
aluminum pole, which extends in length. Various pool-cleaning tools, such as
brushes or vacuums, may then be attached.
An apparatus or device used to monitor specific chemical residuals, levels,
constituents or demands in pool or spa water. Kits usually contain reagents,
vials, titrants, color comparators and other materials needed to perform tests.
The most common pool and spa water tests are: pH, total alkalinity, free
available chlorine, water hardness, cyanuric acid, iron and copper.
Small plastic strips with pads attached that have been impregnated with reagents
that can be used to test pool water for residuals, levels, constituents or
demands. The strips are usually dipped in the water, and the resulting colors of
the pads are compared to a standard set of colors to determine concentration.
TIME CLOCK A mechanical or
electrical device that automatically controls the periods that a pump, filter,
heater, blower, automatic pool cleaner or other electrical devices are on or
A test used for acid and base demands, total alkalinity and calcium hardness. It
creates an end-point reaction by adding
drops of the reagent to elicit a change in the sample's color. The number of
drops required correlates with the measurement.
The total amount of alkaline materials pre- sent in the water. Also called the
buffering capacity of the water. It is the water's resistance to change in pH.
Low total alkalinity causes metal corrosion, plaster etching and eye irritation.
High total alkalinity causes scale formation, poor chlorine efficiency and eye
The total amount of chlorine in the water. It includes both free available and
TOTAL DISSOLVED SOLIDS
Also called TDS - A measure of the total amount of dissolved material in the
water. It is comprised of the spent or carrier chemicals added every time
chemicals are added, as well as the hardness, alkalinity, chlorides, chlorides,
sodium, magnesium, calcium, etc. Maximum amount in pools is 2500 ppm. Maximum in
spas is 1500 over starting TDS. The only way to effectively lower TDS is to
drain part or all of the water and replace it.
THERMAL COVER An
non-transparent insulating flotation cover used to help prevent evaporation and
heat loss from pools and spas.
A slow-dissolving, tablet or granular, stabilized organic chlorine compound
providing 90% available chlorine. Used for regular chlorination but must be
dispensed using a floating feeder or an in-line feeder (chlorinator). Trichlor
contains an ingredient (cyanuric acid or stabilizer) that prevents the chlorine
from being destroyed by the ultraviolet (UV) rays of the sun. Trichlor has a pH
of 2.8, and regular trichlor tabs should not be placed in the skimmer as the low
pH will corrode the metal components in the equipment.
TURBIDITY The cloudy
condition of the water due to the presence of extremely fine particles in
suspension that cannot be trapped by the filter because they are too small.
Adding a clarifier, such as an organic polymer or alum, will coagulate the
particles and make the filter more efficient.
TURNOVER Also called
turnover rate - The period of time (usually in hours) required to circulate a
volume of water equal to the volume of water contained in the pool or spa. Pool
capacity in gallons, divided by pump flow rate in gallons per minute (gpm),
divided by 60 minutes in 1 hours, will give hours for 1 turnover.