Zakki Sieve... The Direct Suction Pre-Filter

How to Plumb Your Zakki Sieve W/ Multiple Inlets

How to Plumb Your Zakki Sieve W/ One Inlet 

 

Dynamics and Disadvantages of a Gravity Fed Sieve


 

Removing and Installing the Sieve Screen


 

 

 

In order to understand the need for the new Zakki Sieve Filters you need to fully understand what a sieve filter is, how they operate, and what their advantages and disadvantages are. Wedge wire sieve dewatering filters have been used for a very long time in many industries. All of them have had small differences that set them apart from the rest, but the main function of these filters is to remove solid waste from the water column. Each filter has something that is called a wedge wire sieve screen. This screen is made out of support rods (provide a skeleton for the screen) and wedge wires. The wedge wires are also called "V" wires by some, but they are the same thing. The top flat surface of the V is where the solids are separated from the liquid and each wedge wire has a small space before the next wire. This space is called the slot opening and it dictates the separation point between the water and waste. Using a 250 micron slot opening, means that particles larger than 250 microns in size will be separated from the water and remain trapped on the screen.  By placing the wedge wire screen at an angle, the water will pass straight through the screen, but the debris being separated will be pushed down the slope, and remain out of the water column. This way the contact area of the screen remains open and water doesn’t build up above the screen. The slope of the screen not only helps to push the debris down to the bottom of the screen, but it also effectively reduces the slot opening of the wedge wire screen. This picture illustrates my point…


Now that you know a little about the screen itself, you need to know how the water gets supplied to the screen. There are two main ways of accomplishing this task.

Pump Fed Sieve Filters…
The first way of supplying water to a sieve screen is by having a water pump suck directly from the pond, and pump the dirty water into the sieve filter. This is by far the cheapest and least complicated method of water delivery, but it is also the least effective method. The large debris will end up getting trapped inside the pumps leaf basket where it will quickly decompose and add unnecessary nutrients into the water column. The medium sized particles will get chopped up by the impeller inside the water pump. This will send more small particles to the sieve screen. These extra, small particles would have been contained inside the medium piece of debris that would have been separated from the water column by the screen, but now there is a good chance it could pass through the slot openings and on to the rest of the filtration. One benefit of the pump fed sieve filters is that it can be installed above pond water level. 

Gravity Fed Sieve Filters…
This method of water delivery is a little more complicated, and requires the use of moving parts. The top of the filter is usually installed 1” above maximum pond water level, and the remainder of the filter is below water level. The water pump is placed after the sieve, so the pumps impellers only receive filtered water which reduces the maintenance for the pond owner. This method also allows for large debris to enter the filter intact so the extra small particles remain trapped inside the larger debris. The moving parts I mentioned earlier are attached to a float system that moves up and down based on how much water is being sucked out of the filter. Some manufacturers use a moving tray which requires flexible bellows that can warp and twist which will reduce the total flow. Other manufacturers use a stationary tray and have an adjustable weir that travels up and down. The adjustable weir is the better of the two designs, because it allows for more adjustment, and there is nothing inside the filter that can reduce the total water flow. One major downfall to these gravity fed sieve filters is their complete dependence on a constant water level inside the pond. The internal float systems have a limited amount of travel, so if the pond water level begins to drop, then water pump will begin to suck air. This requires that filtration systems water flow be slowed way down so as not to damage the water pumps. If a large water change is needed, then the filtration system may need to be shut down completely until the regular water level is regained. This can have an impact on the biological filtration that follows these gravity fed sieve filters. It doesn't seem like a big deal, but it can get frustrating at times always having to reduce the water flow during water changes.



Up until now those were the only two methods available for delivering water to the wedge wire sieve screens. Each method had its positives and negatives, and you needed to determine which were more important to you.

Here at Deepwater Koi Innovations, we were not happy with those two choices and set out to design a sieve filter that combined the advantages of each delivery method, and eliminate the negative attributes. It took a lot of research and testing but we feel we have created the ultimate in pre-pump wedge wire sieve filtration.

Introducing the NEW Zakki Sieve Filter!

These sieve filters can be used above water level, or at water level, and with large or small suction lines. The pond water level is no longer an issue so massive water changes can be performed without worry. The water pump is always after the sieve filter, so only clean water is going through the pumps impeller. The water pump never has to be shut down when performing any filter maintenance. That means you can remove the wedge wire screen, clean it off and replace it without dealing with unplugging the water pump, nor with rushing water inside the filter. These filters operate under a vacuum which allows it to be used in so many different applications.
The Zakki Sieve Filter has a 250 micron wedge wire sieve screen which removes the debris down to roughly the size of fine table salt. The Zakki Sieve was designed so that the water pump remains on all the time, even during maintenance. This means you never have to worry about loosing the prime on the pump.  This is accomplished by using a bypass mode on the filter whenever you need to perform maintenace.  The Zakki Sieve also utilizes the power of the water pump to flush off the wedge wire screen. 
This is a filter that can be neglected for a long time without maintenance, but it is not recommended that you do this on a regular basis.  The longer the debris is trapped on the sieve screen, the more excessive nutrients will be dissolved into the water column. The operation of the filter will be the same whether it is cleaned everyday or left alone for two weeks, only the water quality will be affected.


Here is the 16" Zakki Sieve after two weeks of neglect...

That is over 6" thick of waste collected in the waste trough.

 

 

The Zakki Sieve comes in two different sizes  to suite your needs...

16” Zakki Sieve ($1300 + freight) has a max flow rate of 4500 GPH and is limited to a single 3”-4” inlet or up to three 2” inlets.

24” Zakki Sieve ($2500 + freight) has a max flow rate of 9000 GPH and can have up to three 3”-4" inlets or up to five 2” inlets.

The sieves come with Two 2” 3-way valves so you can incorporate the bypass plumbing into the filter.  3” 3-way valves are available for an additional $75 if you want to lower your total dynamic head loss on the plumbing.  The sieves also come with a union for every pipe connection on the filter.

 Please specify what kind of plumbing configuration you want on your sieve in the comments section of the order form.

Freight will be charged seperately if the order is placed online.  If you prefer to process only one charge, then please e-mail Zac@DeepwaterKoi.com your order, and we will calculate shipping costs for you then.

Zakki Sieve... The Direct Suction Pre-Filter
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  • Item #: Zakki Sieve
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Price $1,300.00