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ALGAE –  general class of microscopic plant life that includes many species. It enters water by rain, wind, dusts storms, or tap water. Some float freely on the water; other grow on surfaces as unsightly and are slippery.  The most common types found in pools are green, black, and mustard. Proper use of sanitizers, algaecides, and maintaining proper water balance help prevent algae from growing in your pool.

  (a.k.a. ALGAECIDE) – A chemical that kills algae.

– Total alkalinity measures the pool’s ability to buffer pH changes.

BACKWASH – The method regularly used to clean sand filters and D.E. filters by pumping water backwards through the filter media and out through a discharge or backwash system.

– Water is considered balanced when the pH, total alkalinity, calcium hardness, metal content, sanitizer, stabilizer (if needed), and total dissolved solids are in the proper ranges for your pool type and sanitizer type.

– One form of chlorine used to sanitize pools and spas. Usually comes in powder form and must be dissolved in water before being added to the pool or spa. This form of chlorine usually contains 65% available chlorine.

– Measure of the calcium content of the water. If it is too high, the water is corrosive. If it is too low, it will cause scale build up.

Cartridge Filtration – Cartridge filtration is used in swimming pools and to a greater extent to treat spa water.  Cartridge filters generally filter suspended particles in the pool water down to 15 microns (a grain of Table Salt is generally referenced at 100 microns).

CHLORAMINES – Chlorine that has been bound up by swimmer waste. This form of chlorine will not kill algae or bacteria. The level of combined chlorine in your pool added to the free chlorine residual gives you the total chlorine reading.

CHLORINE – A sanitizer and disinfectant added to pools and spas to prevent and kill bacteria and algae. Chlorine comes in numerous chemical forms and methods of application.

CLARIFIER – (also referred to as as WATER CLARIFIER) Collects small unfilterable particles into larger filterable masses. Does not affect pH.

D.E. FILTER – A Diatomacious Earth Filter (D.E. Filter) filters particles as small as 4 microns from your swimming pool water (a grain of Table Salt is generally referenced at 100 microns). Hence, a D.E. Filter provides the most efficient cleansing/filtration of your swimming pool water. 

D.E. POWDER – Diatomaceous earth. A white powder composed of fossilized skeletons containing microscopic pores from one-celled organisms called diatoms. Used as a replaceable filter media for D.E. swimming pool filters.

– The active chlorine level in the pool water after the chlorine demand is satisfied.

– Introduces copper ions into the water to aid in killing algae and bacteria. A chlorine residual must still be maintained and shock treatments are still required.

– A sodium hypochlorite solution that only contains about 10 to 12% available chlorine and an extremely high pH, resulting in the need to add pH decreaser to your pool or spa to counteract the effects on the pH.

– A fast dissolving, granular form of chlorine that has approximately 35% available chlorine.

– A group of chemicals that are used to remove ammonia compounds, nitrogen compounds, and waste from swimmers. These compounds do not contain chlorine and do not kill algae or bacteria.

– Introduces ozone into the water. Ozone is a strong oxidizer that helps control algae and bacteria. A chlorine residual must still be maintained and shock treatments are still required, but they can help reduce the amount of chlorine you must add to your pool or spa to maintain the required residual.

– An acid. Lowers the pH and alkalinity of water.

– Raises pH in pool water. Add directly to pool with pump in operation. Allow pool to recirculate 2-3 hours, retest pH and repeat treatment as necessary.

– A system for measuring the acidity or alkalinity of water. Readings above 7 are alkaline; readings below 7 are acidic. Maintaining a correct pH balance in your swimming pool is very important.

– Parts per million, a standard measure of chemical or mineral concentration in swimming pool water.

– Sand filtration is the oldest type of filtration. Sand is considered a permanent media, lasting between 5 and 15 years before needing replacement. The dirt particle size removed is usually between 25 to 50 microns. 

– Super chlorination; by adding 5-10 times normal chlorine dose. Done periodically to remove accumulated organic contaminants brought into the pool by wind, rain, bathers, etc.

– A container, usually plastic with a handle, located inside the skimmer that is designed to catch such things as rocks, leaves, hair, etc. to help protect the plumbing pipe and pump from clogging.

– A granular sun screening chemical that reduces chlorine costs. Also known as conditioner and cyanuric acid.

– Similar to the skimmer basket, except it is located in the suction side housing of the pump

SWIMMER WASTE – Includes such items as suntan oils, makeup, body oils, sweat, spit, urine, etc. These bind chlorine into chloramines if your chlorine level is not high enough. It requires a large quantity of chlorine or non-chlorine shock to get rid of them.

– The combination of the free chorine residual and the level of combined chlorine in your pool or spa. This number alone is not a true measure of how sanitized you pool or spa is. Remember only the free chlorine residual is what is active and working to kill algae and bacteria.

– Collects small unfilterable particles into larger filterable masses. Does not affect pH.