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You might also consider cation exchange softening to reduce Scale forming hardness. Nanofiltration is another treatment option. S. Bush www.water-eg.com

Silt density index is a measurement of the colloidal suspended matter in the water supply. Colloidal matter is not filterable by sand filter alone or cartridge filter or softener or carbon filter. Some coagulants can be effective in some cases, but not every, when used in conjunction with sand...

I've experienced what you're seeing and doing. The likely culprit is poor liquid distribution and/or collection. If the regenerant distributor and/or under drain collector was never inspected, tested (hydraulically) or cleaned prior to the resin replacement, "hideout" could be occurring. The...

Detention time is 30 minutes. Serpentine flow path.

Thank you both for your interest. I've learned that the white floc is elemental sulfur. It is filterable using conventional sand media. If the feedwater pH were lowered sufficiently, as BIMR mentions, elemental sulfur wouldn't form after aeration.

The last two paragraphs of my post are what I'm really looking for.

We are treating 650 gpm of well water to reduce hydrogen sulfide odor. Immediately after aeration (bubble-tray type), we are seeing a feathery, white "floc" that resembles surface water treatment floc, however there are no coagulants added to this feedwater. Only aeration, no chemicals, not...

If I may be so bold as to answer your last question ahead of the General Filter salesman's pending response. Their trough is surrounded by curve-plate baffles (what you called wings). These two plates overlap underneath the trough, but at the same time, they are off-set in the vertical...

It is always better to remove iron and other contaminants as far upstream of the critical process as possible. Chemical conditioning does not remove the iron from the feedwater and, therefore, when operating conditions change, such as temperature elevation, the iron can become oxidized and form...

It's definitely going to "brown" the interior coating in that spot. Will that compromise the coating? I wouldn't want to find out by trial and error. The first time one of our welders forgot to install an exterior bracket for a tank name plate, I decided to have him affix the bracket with...

Answer: (1) Backwash flow range is reasonable for combined air-water method. Answer: (2) Combined air-water method must have lower backwash rate. Check with the manufacturer of the air-water backwash collection trough. They should be the ones feeding design information to your mechanical...

Good eyes, bimr! I missed the high temperature factor. Inversand, the manufacturer of Greensand, indicates precautions should be taken above 80-degrees F. Another acceptable means of removing oxidized iron and manganese from hot water is by using a high-rate anthracite filter (or filters, in...

This forum is specifically for engineering topics and not commerce, so your post might be removed. I will try to answer your question from an "Engineering Tips" point of view. Since you specifically mention the product, Manganese Greensand, why don't you contact the company that mines and...

GarySCWSVI, Blending 18 meg water with raw water to 1 meg target quality: seems like it might be extremely difficult to acheive and maintain. For instance, at a flow rate of 3 gpm/cubic foot of resin and a raw water quality of 100 ppm of total dissolved solids (as CaCO3), what would be the...

Another method might be metalizing with pure zinc or aluminum wire using a thermal-spray or flame-spray aparatus. We use Sulzer Metco wire. Metalizing is used quite a lot on bridges. I think Metco's web site mentions concrete applications, or you could call them. S. Bush www.water-eg.com

PurewaterGuy, This technique is sometimes called "the poor man's mixed bed". You will most likely acheive a range from 1 - 5 megohm depending on the influent water chemistry. You should install a meter or quality light after the anion unit and prior to the cation polisher. This will...

Bimr, Oh. I see what you're saying...as sodium leakage occurs, in theory, pH will rise. S. Bush www.water-eg.com

Bimr, Are you sure about the pH of deionized (DI) water being about 10 units, because my experience has proven that the pH of 18 meg water is neutral. When DI water is exposed to the atmoshpere or comes into contact with other foreign materials, then pH will change as electrolytes are...

Replace the two mixed bed tanks with a cation tank followed by an anion tank followed by another cation tank (all in series). This won't work without the cation polisher, so don't omit it. In addition to meeting all of you effluent objectives, if you use the same size exchange vessels, much...

Twenty percent of 150 inches is 30. A typical 60 inch torispherical head (i.e., the top head) would not afford 30 inches of vertical rise or freeboard or void. The freeboard volume requirement will depend upon the specific cleaning and maintenance requirements for the carbon media that is...