See Total Dissolved Solids.
A plumbing fitting used to bring two pipes together into one, or vice-versa.
A kit comprised of reagents used to test the water balance and sanitizing level of your pool water.
A mechanical device that controls the timed operation of your electrical equipment, primarily your filter and booster pumps.
The method used to test for total alkalinity and water hardness in swimming pool and spa water. An indicator reagent is added to a sample and then another reagent (a titrant) is added until the sample changes color. The drops or amount of titrant used are equal to the concentration in parts per million.
The total amount of alkaline materials present 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 irritation. The test measures for hydroxides, carbonates and bicarbonates.
(also Total Available Chlorine) The total amount of chlorine in the water. It includes both free available and combined chlorine.
(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, sodium, magnesium, calcium, etc. The maximum amount in a pool is 2,500 parts per million (ppm). Maximum for a spa is 1,500 over starting TDS. The only way to effectively lower TDS is to drain part or all of the water and replace it.
(also called TRICHLOR) A slow-dissolving, stabilized organic chlorine compound in tablet form that provides 90-percent 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.
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.
Cloudy condition of the water due to the presence of extremely fine particles in suspension that can not 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. Turbidity is measured with a Nephelometer and expressed in units of opaqueness called NTU (Nephelometer Turbidity Units).
The amount of time it takes your pump to move all the water in your pool through the filter and back again. Pools are usually designed for an eight-hour turnover.