TDS: See Total Dissolved Solids

TEE:  A plumbing fitting used to bring two pipes together into one, or vice-versa.

TEST KIT:  A method used to test the water balance and sanitizing level of your pool water.

TIME CLOCK:  A mechanical device that controls the timed operation of your electrical equipment, primarily your filter and booster pumps.

TITRATION:  A method of testing for total alkalinity, calcium hardness and acid/base demand by adding a titrant, drop by drop until a color change is observed.

TOTAL ALKALINITY:  The ability of the pool water to resist changes in pH. The "buffering" capacity of the water. Additions of Sodium Bicarbonate will increase the levels, expressed in ppm.

TOTAL DISSOLVED SOLIDS (TDS):  A measure of everything that has ever dissolved in the water; all the matter that is in solution. High TDS levels can oversaturated your water, causing all sorts of reactions.

TRICHLORO-S-TRIAZINETRIONE: a chemical compound used as an industrial disinfectant, bleaching agent and a reagent in organic synthesis. This white crystalline powder, which has a strong "chlorine odour," is sometimes sold in tablet or granule form for domestic and industrial use.

TROWEL: A pool trowel is a flat-bladed tool with rounded ends used to apply viscous or particulate material coatings to concrete, especially on pool decks.