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I have a question regarding Greensand leahing further Mn into fitrate water. I am running a trial using a greensand filter to remove 2ppm of Mn in groundwater. I have followed the manufacturers instructions and am suprised to note the Mn is increasing once passing through the filter! Mn after...

Not sure how to specify the pressure requirement of a pump when sizing a pump for a deep bed pressurized sand filter (Total bed depth 2 metres in six graded layers) with a desired flow rate of 120-180litres per min. The pump is for duty only. The filter is 1.8m in dia. In addition am I correct...

Is it possible to remove Hydrogen Sulphide and or CO2 dissolved in groundwater (pH 5.4) by passing the water through a vacuum?

I have 50mm hollow 316 TUBE with 80-100 deg C air running through - on the outside of the pipe I have 17-20 deg C bore (ground) water low in calcium some iron and manganese running past the tubes. The Tubes are pitting on the outside and failing. I considered teflon coating but this would...

I have ground water high in iron and low in Calcium and Mangnesium. Iron approx 47mg/l Ca approx 2mg/l Mg approx 7mg/l I presently use NaOH to raise the pH to precipitate the iron prior to filtering. The resulting water is poorly buffered and used for aquaculture where hardness should be in...

I was curious as to a method (simple if possible) that can test for 316 as apposed to 304 stainless steel. A test that possibly could be done on-site would be the most advantageous. Thanks

I have a water filtration plant with the primary purpose of removing 50ppm of Fe2+ from ground water. We utiliswe approx 10000-200000 litres per day I am looking for a use of the waste product and was considering Ferric chloride, and was curious as to how it is made - as maybe we could alter...

I am using sodium bicarbonate in an closed recirculating aquaculture system indoors. The biofilters are submerged in each tank. The nitrification process is producing acids and reducing pH. We buffer twice daily with sodium bicarbonate. Is it possible that the bicarb is also breaking down...

I am using sodium bicarbonate in an closed recirculating aquaculture system indoors. The biofilters are submerged in each tank. The nitrification process is producing acids and reducing pH. We buffer twice daily with sodium bicarbonate. Is it possible that the bicarb is also breaking down...

I am using 50% strength caustic soda with a dosing unit. The caustic is outdoors and is in a region where outside air temps will drop below 10 degrees C. What is common practice to keep the liquid warm. I have read somewhere in the past that in colder climates that the concentration should be...

When raising the pH of ground water with high fe2+ concentration of 47ppm, using NaOH or Lime, a green floc is produced - if the water is aerated first, the floc is brown? Both situations result in iron removal but I am curoius as to what is actually happening? Regards

When using Potassium Permanganate to oxidise Iron and Manganese, is there residual Potasium left in the water?

I intend on running ground water with low pH, high C02 and high iron concentrations through a sand filter with limestone media to allow me to effectively remove the CO2 and hence oxidise the Fe2. Has anybody any sugesstions or experience in doing this?

I have emptied a sand filter which was used as a final stage for treating potable water. At the base the medi was large chunks of quartz - why would this be used - particularly the quartz in lieu of other smooth gravels? Regards

I am passing iron rich ground water through a tank filled with limestone prior to aerating the ground water. The tank has a pump in it which is fouling every 14-20 days. The limestone does the job without the need for chemical dosing - yet the method is not very good. Does anybody have any...

Can anybody tell me how I could use a digital video camera to count fish going through a channel (say 300mm wide) Note the fish are of various sizes and may swim in groups. I look forward to replies

Can anybody tell me how I could use a digital video camera to count fish going through a channel (say 300mm wide) Note the fish are of various sizes and may swim in groups. I look forward to replies

I have a ground water bore that has a high concentration of iron (40ppm) Manganese 2ppm Magnesium 10ppm and H2S. With pH adjustment and aeration I can get the majority of the contaminents out. I am looking for various methods of removing the flock with a continuos feed period of approx...