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AN INEXPENSIVE AND EASY ALTERNATIVE TO TABLET CHLORINATION. Click here for more information!

HOW DO YOU UNCLOG DRAINS WITHOUT USING CAUSTIC, OVER-THE-COUNTER PRODUCTS? Click here for more information!

KNOW YOUR BIOTA (bugs)! Click here for more information!

INFECTIOUS AGENTS POTENTIALLY PRESENT IN UNTREATED DOMESTIC WASTEWATER. Click here for more information!

IMPORTANT INFORMATION FOR OWNERS OF SEPTIC AND ONSITE TREATMENT SYSTEMS. Click here for more information!

WHAT TYPE OF CHLORINE SHOULD BE USED FOR WASTEWATER CHLORINATION? Click here for more information!

SEPTIC ODORS. Click here for more information!

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RESPONDING TO POWER OUTAGES AND FLOODS. Click here for more information!
 
 
 

Wastewater Disinfection - Chemicals & Additives

  • Wastewater Disinfection

    • Tablets

      Currently there are two predominant types of chlorine tablets found on the market: Calcium hypochloride and chlorinated isocyanurates.

      • Calcium Hypochlorite (septic disinfectant tablets)

        These tablets, such as Norweco’s Blue Crystal tablets (white tub, blue top), are the only readily available tablet product labeled and approved for wastewater disinfection. They are very reactive and quickly kill bacteria present in wastewater (99% of the bacteria kill takes place in the first 10 minutes following contact). Just as important, the chlorine residual that is present in the water after disinfection will dissipate rapidly so that it does not damage the receiving environment.

        All chlorine products are hazardous and must be handled with care. It is against the law and extremely dangerous to repack the tablets into a smaller container or a plastic bag.

        These tablets are available at most Home Depot stores and most Lowe’s stores and are located in the PLUMBING DEPT. The 10 lb. bucket holds approximately 32 tablets.

        • Guideline for Use

          The tablets should be inserted in the chlorination tube at the rate of 1 to 2 tablets per person per month, with no more than 4 or 5 tablets being inserted at one time. The tube, which can hold 12 to 15 tablets, should never be filled with tablets because the tablets are soft and humidity in the system can:

          • Make the entire column of tablets swell up and stick in the tank so the ones on top do not fall to the bottom of the chlorination tube as the bottom tablets dissolve, or
          • Cause all of the tablets to dissolve at one time and turn to a gooey mess.


          Not every household will fall into the 1 to 2 tablets per person per month guideline, sometimes you may use more tablets, sometimes you may use less; for example, is everyone is in the house during the day or do you all leave the house for work and school, do you travel a lot, do you have a lot of guests, do you have the new low-water use laundry systems, do you have a garden tub you fill on a daily basis.


        • Be Proactive – Do Not Depend on Your Monitoring Company for Your Disinfection!

          Most monitoring contracts provide for visits every 4 months, although there are some permitting agencies or situations that may require visits more frequently. Generally, if more than one person is living in your home, it is not possible for a monitoring company to insert enough disinfectant tablets in your chlorination tube to last the household for 4 months – if the guideline of 1 to 2 tablets per person per month, with no more than 4 or 5 tablets being inserted at one time is adhered to.

          If yours is a one-person household, it could be possible for a maintenance provider company to install enough tablets to last you 4 months. However, if your maintenance company is putting tablets in for you – do the math! If the provider is installing tablets for you once every 4 months and there are:

          • 2 in the household x 2 to 4 tablets per month x 4 months – you will be using 8 to 16 tablets in 4 months
          • 3 in the household x 3 to 6 tablets per month x 4 months – you will be using 12 to 24 tablets in 4 months
          • 4 in the household x 4 to 8 tablets per month x 4 months – you will be using 16 to 32 tablets in 4 months


          For each of these households, more than 4 to 5 tablets will have to be inserted in the chlorination tube at one time to disinfect the wastewater for 4 months. Installing the chlorine tablets yourself and monitoring your own chlorine use is always the best and smartest choice. Since the tablets will dissolve according to the amount of water your household uses, you are the only one who has a handle on your water use. Even if enough tablets could be installed in the tube to disinfect the water for 4 months, the monitoring company does not have a clue as to how much water you use. Remember, it is your family that is in danger from the fecal bacteria in your wastewater treatment plant if the water is not disinfected, not your service provider’s family.


      • Chlorinated Isocyanurates, aka Tri-Chlor (swimming pool tablets)

        These tablets (usually white tub with a yellow or orange top) can be purchased from swimming pool supply stores, discount retail stores and mail-order outlets. Due to their widespread availability, Tri-Chlor tablets often make their way into wastewater treatment systems, though their use in the systems is both dangerous and illegal.

        Tri-Chlor tablets dissolve more slowly than calcium hypochloride and create a residual that does not readily dissipate. These tablets work well in swimming pools, where clean water is continually recirculated and slow dissipation of residual is desired, but they are unsatisfactory for wastewater treatment. Tri-Chlor tablets will not thoroughly disinfect the effluent, and the chlorine residual remains for long periods of time to damage the receiving environment.

        The chlorine gas generated from the Tri-Chlor tablets can damage and rust the wiring in a wastewater treatment system from the effluent tank to the control box, making for a possibly expensive repair.

        An additional danger can arise due to an accumulation of moisture within the Tri-Chlor tablet. Designed to be totally immersed in water, Tri-Chlor tablets that are exposed to periodic flows of liquid begin to decompose and release an explosive gas called “nitrogen trichloride”. If a sufficient concentration of nitrogen trichloride builds within the wastewater system, it could be ignited when exposed to an open flame, electric spark or organic contaminates. These explosions can be devastating, causing extensive property damage and potentially serious injuries.


    • Automatic Bleach Dispenser

      We carry an automatic bleach dispenser that we can install on your wastewater system that makes it possible for 6% household bleach (sodium hypochloride) to be used to disinfect your system instead of chlorine tablets. The residential model holds approximately 4 gallons of bleach, which should last a family of 4, with average water use, approximately 4 months. We also carry an automatic bleach dispenser for industrial and commercial use that holds up to 8 gallons of bleach.

      For those of you who question the legality of the use of automatic bleach dispensers with the aerobic septic system, in 2002 The Texas Commission on Environmental Quality sent a letter to the manufacturer of the bleach dispenser we carry that states, “we have no objections to the use of this disinfection device in OSSF systems.” In addition, for those of you in Tarrant County, a letter to the area septic installers from the Tarrant County Public Health Department dated 3/13/2008 stated that the manufacturer of the automatic bleach dispenser that we install is the only liquid bleach system approved by Tarrant County for new aerobic septic systems installed in that county.

      Click Here for more Automatic Bleach Dispenser information or call our office for availability and pricing information for our Automatic Bleach Dispenser.



  • Additives – to use or not to use?

    Septic tank additives are readily available for purchase basically everywhere: in home improvement or building stores, hardware stores, and supermarkets. They are advertised on TV and on the internet, even promoted by telephone or door-to-door solicitation. Most homeowners do not understand the possible impact of using commercial additives in their septic system.

    • A "starter" additive is not required for bacterial action to begin in a septic tank that is new, one that has not been used for a while, or one that has been recently pumped. Many bacteria are present in the waste deposited into the tank and will grow and colonize in the tank under normal conditions. The process is a natural biological process that does not need an additive to help it do its job.

    • Some experts say additives do more harm than good, and some believe that they are not harmful, but they don't do much of anything at all, except cost money. Other than the companies that manufacture and/or sell septic additives, we could not find any source – scientist, sanitary engineer, or government agency – that has recommended the use of septic system additives.

    • Those products that claim to reduce or eliminate the need to pump the system on a regular basis is of particular concern. Additives that are advertised to "eliminate" tank cleaning may cause the sludge layer to fluff up and be washed out into the drain field, plugging soil pores. Some additives, particularly degreasers, may contain carcinogens (cancer-causing elements) or suspected carcinogens that will flow into the ground water along with the water from the soil treatment unit. Pumping solids out of the tanks is considered by the septic industry to be a vital and basic practice to septic system maintenance.


 

 

Aerobic Septic Service Company
P.O. Box 1823
Azle, TX 76020
Ph (817) 270-9046
Fax (817) 444-9162

Call Aerobic Septic Service Company Today

Aerobic Septic Service Company
8765 Spring Cypress Lane L-210
Spring, TX 77379
Ph (832) 904-9529
Fax (936) 588-3491

 

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