Page 118 of AES Mastercatalog by Aquatic Eco-Systems

bluemax boots these 16 knee high boots are specifically made for use in seafood and poultry processing plants the seamless molded construction makes them completely waterproof and very durable comfortable cushion insoles are replaceable built-in steel toe and steel shank provide extra protection available in men s sizes 6­15 add shoe size after part number to designate size e.g 89102-8 89102 48.30 rubber overshoes whether you work with fish farms aquariums wastewater or lake maintenance your feet get wet these are 100 percent waterproof and have a four-way cleated sole for superior slip resistance fit over most work shoes with reinforced toe and heel areas sizes listed fit over the same men s shoe size 13000 130010 130021 13003 130040 sizes 6­7 sizes 8­9 sizes 10­11 sizes 12­13 sizes 14­16 23.20 23.20 23.20 23.20 23.20 13000 environmental boots/hat 16 pvc contractor boots 16 hazmat boots these durable steel toe boots will withstand 14,000 volts of ac current for 1 minute showing no leakage in excess of 5 milliamps the injection-molded seamless construction is 100 percent waterproof cushioned insoles are removable kick-off lugs make them easy to take off available in men s sizes 6­15 add size after part number e.g 88722-9 88722 74.24 designed to provide exceptional puncture resistance these heavy-duty boots are ideal for use by contractors and farmers they feature a steel safety toe and full steel midsole guaranteed waterproof the comfortable cushion insoles are replaceable and the polyester lining can be easily cleaned pull-ups and kickoff lugs for easy on and off available in men s sizes 6­13 add size after part number e.g 86622-12 86622 34.65 6 steel-toe work shoes these rugged boots are formulated with thick polyurethane and pvc and provide excellent waterproof protection in the workplace heavy-duty laces steel toes and hardened steel ladder shanks make them perfect for use in chemical plants hatcheries food processing plants and outdoor farms cushion insoles are replaceable nonslip self-cleaning soles give traction in the mud available in men s sizes 6­13 add shoe size after part number e.g 86104-10 86104 33.80 pith helmet tried and true performance everyone needs sun protection outdoors the pith helmet is popular around the world because its form follows function to keep the head cool while keeping the sun off ears face neck and out of eyes the porous material is very cool providing about 70 percent shade these are high-quality reasonably priced hats and feature an adjustable headband that fits all made in usa h1 21.90 tech talk 76 hardness alkalinity and carbon dioxide the relationship among hardness alkalinity and carbon dioxide what is hardness and why is it important you know you have hard water when soap does not lather well hard water causes scale deposits after it evaporates and it forms clogging deposits in pipes and air diffusers in aquatic systems adequate hardness is important and depends mostly on the concentration of calcium and magnesium ions hardness is particularly important to newly hatched fish that obtain much of their calcium directly from the water generally freshwater fish do best when hardness is maintained near 100 mg/liter caco3 calcium carbonate to increase hardness use calcium chloride cacl2 why is alkalinity important alkalinity is the buffering capacity of water that is its ability to maintain a ph of 7.0 or above in aquaculture alkalinity is most often influenced by the bicarbonate ion the negative ion in sodium bicarbonate nahco3 when kept above 100 mg/liter caco3 alkalinity will usually be an effective buffer depending on the level of carbon dioxide co2 in the water see graph alkalinity should not fall below 80 mg/liter caco3 as it is the source of carbon for nitrifying bacteria and is consumed during nitrification to increase alkalinity add sodium bicarbonate to decrease alkalinity add acid how are hardness and alkalinity related hardness and alkalinity are both expressed as mg/liter caco3 in tap water when the concentration of hardness and alkalinity are the same both are probably due to dissolved calcium carbonate calcium carbonate does not dissolve well above ph 7.0 so other chemicals like calcium chloride and sodium bicarbonate can be used to adjust hardness and alkalinity independently if alkalinity and hardness are too high calcium carbonate will precipitate on air diffusers heaters and other submerged equipment how is alkalinity affected by carbon dioxide carbon dioxide may build up in water as a result of respiration by fish and bacteria in poorly buffered water this can cause a drop in ph below 7.0 that can inhibit nitrification aeration can drive off co2 and in the process raise the ph adequate alkalinity will ensure stable ph and provide carbon for nitrifying bacteria carbon dioxide level can be estimated using the graph on this page if the ph and alkalinity are known order online aquaticeco.com order by phone 877-347-4788 tech support 407-598-1401 115

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