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We have always run both since the plant was built in the late 70's. We just switched to magnafloc e40 from zeta-lyte 1a polymer after having our water jar tested. I never thought about running without alum, but I am definitely thinking about suggesting it. We are running 1000gpm now not 600gpm...

We remove most of the iron and manganese through aeration. The clarifier settles out the remaining iron. The backwash feeds back into the clarifier at about 200gpm, but that only runs for about four hours a day. Running a higher alum % really helps but causes us to go over our limit.

Hi semo. Ground water is our source and and our coaggulation, flocculation and sedimentation all take place in one tank. In addition, our filter backwash pumps feed back into the clarifier. pH is about 7.0-7.2. One person said it should be lower, the previous operator said it should be in the...

We are using liquid polymer(Magnafloc E40)with a weight of 0.016. The plant I work for is not going to spend the money for a huge amount of testing. The plant has never ran at that flow so I can't look at back notes. We pump about 820,000gpd. We get a good sludge blanket. This also may be an...

I am looking for information on polymer and if dosing works as a ratio or if more is not better. We don't have a jar tester available but know that 5 gph of polymer @ 600 gpm works great but we raised the flow to 1000 gpm. Would by using a simple ratio be a way of calculating a new dosage or...

Thanks for the responses. Right now we are using Wallace & Tiernan Series 44 pumps for lime, polymer and alum. The pumps are 25 plus years old and don't pump at the set rate consistantly enough. The engineer that oversees the mechanical running and upgrades is looking to put in peristaltic...

Thanks for the response hydrae and semo. I personally think the plant is not deigned for that amount of flow. We almost doubled our well output from previous years and it really increases the amount of iron the clarifier has to settle out. Its getting harder and harder to get the filters clean.

My plant had a jar test done last week but the company only checked the effectiveness of various polymers and the one we are currently using. When I asked what amount we would need he said we would have to try different amounts. he didn't solve my problem. We had run the same feed settings for...

Is there a formula that can be used to calculate how much Alum and Polymer will be needed for a clarifier with a capacity of 249,000 gals and 1000 gpm coming in? I want to have a good sludge blanket and clear up a heavy floc that is starting to develop but not settle out. It sounds like from...

Hi CCW. Great information. Just what I was looking for. The water treatment plant where I work is replacing the metering pumps for lime and polymer next year and going with the peristalic pumps. Any thoughts on these, good or bad? Thanks, Rob

I was told about a new style metering pump where the chemical never touches the inside of the pump. A boot style drive compresses or stretches a larger diameter hose inside to create the back pressure to pump the liquid. Anyone have information on this style pump and who manufactures this type?

Thanks semo, Great information.

I am interested in finding how to calculate a raw water iron sample on a machine that doesn't read higher than 3.30. I know how to cut the sample down and retest it to get under 3.30, but am I adding the readings together each time tested? Thanks.

Thanks for the info. That calculation worked out fine.

I lost the formula for calculating gpm into a tank without the use of a meter. The tank is 50' dia. x 17' high (249551.5 Gals.) Is it right that by dividing 1 foot (14679 gals.) of water by the time it takes the clarifier to rise one foot would give me the gpm? Any help would be appreciated.

Sorry. I am using U.S. gallons. What I should have asked was per gallon of water, what is weight of the polymer in the mixture? The more I look at it, the more it looks like the gallon x .016 may be correct. Thanks for responding.

I have a mixture of 7.5 ml Polymer to 1 gallon of water. how do I calculate the gallons used into lbs? I was given the fomula of Polymer gallons used times .016 but that doesn't look right. In the case of say Alum, it is the gallons used times 5.4.

I think in NJ I am limited to 500lbs but not sure if that includes tanks in use and storage or just in storage.

Thats a lot of reading. Thanks for the info. If there is an answer, it should be in one of those links.

I have been searching my books for the amount of CL2 tanks or lbs allowed in storage by law. Anyone have any information on this?