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Pressurized Filter
What is more effective, a diy pond filter or one you buy at the store?

I just built a 750 gallon pond and I am on a tight budget. As many people know a good filter is usually about $300+ but I don't have that kind of money to spend. I found online a do it yourself filter on youtube. I wanted to know which would you think would be more effective. Here are my two choices, a DIY filter made out of a Rubbermaid container or this store bought one for $100 for a 1,000 gallon pond. My goal is to get one that needs minimal cleaning and keeps the water clear. I provided two links, one of ebay and one of youtube.com. If you don't want to use the youtube link just go on youtube and type "diy pond filter". For ebay type "pressurized filter 1000" and it should be the first one on e-bay.

Definetly go with the DIY filter. Its much cheaper and usually tends to be just as good as one that would have costed hundreds more. I actually built my own pond filter for my 1000+ gal pond and it works great. The one thing you will need to buy though is a UV sterilizer if you want crystal clear water.

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Aqua Ultima II Pressurized Filter 60000 3 FREE SH    US $4,999.95

Aqua Ultima II Pressurized Filter 30000 3 FREE SH    US $3,699.95

Aqua Ultima II Pressurized Filter 20000 2 FREE SH    US $1,999.95

Aqua Ultima II Pressurized Filter 10000 2 FREE SH    US $1,749.95

Aqua Ultima II Pressurized Filter 6000 2 FREE SH    US $1,399.95

Aqua Ultima II Pressurized Filter 4000 2 FREE SH    US $1,149.95

Little Giant Pressurized Biological Pond Garden Filter    US $1,099.00

Fish Mate Pressurized Bio Pond UV Filter 9000 G with UV    US $999.95

Aqua Ultima II Pressurized Filter 4000 15 FREE SH    US $995.95

Aqua Ultima II Pressurized Filter 2000 2 FREE SH    US $849.95

Fish Mate Pressurized Bio Pond UV Filter 6000 G with UV    US $749.95

Aqua Ultima II Pressurized Filter 2000 15 FREE SH    US $699.95

SICCE NINPHEO 50 PRESSURIZED UVC POND FILTER    US $660.29

Aqua Ultima II Pressurized Filter 1000 2 FREE SH    US $649.95

FISH MATE PRESSURIZED UV BIO POND FILTER 9000 GALLON    US $637.88

Pressurized Pond Bio Filter 4000 UV Light water garden pressure large koi fish    US $579.50

LAGUNA POND PRESSURE FLO 3200 PRESSURIZED UVC FILTER UV    US $569.99

Pressurized Pond Bio Filter 2500 UV Light water garden pressure fish biofilter    US $539.55

FISH MATE PRESSURIZED UV BIO POND FILTER 6000 GALLON    US $529.88

Aqua Ultima II Pressurized Filter 1000 15 FREE SH    US $499.95

PONDMASTER BOIMATRIX PRESSURIZED FILTER PUV 4000 40 UV    US $494.88

Pondmaster BioMatrix Pressurized Filter PUV 4000 40w UV    US $494.63

PONDMASTER BOIMATRIX PRESSURIZED FILTER PUV 2000 20 WAT    US $458.88

LAGUNA POND PRESSURE FLO 2100 PRESSURIZED UVC FILTER UV    US $449.95

Pressurized Pond Bio Filter 1500 UV Light water garden pressure fish biofilter    US $447.75

Fish Mate Pressurized Bio Pond UV Filter 3000 G with UV    US $439.95

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You can check your blood pressure all the time

Therefore, an object of this invention is to provide a new system and improved href = "http://www.hospital-homecare.com/category/digital-blood-pressure-monitor-219-504f/1"> pressure monitor blood product manufacturers in particular, the average systolic and diastolic.

This is a particular object of this invention is to provide a blood pressure portable surveillance system that is capable of being manufactured at a relatively low cost.

According to these and other objects, it is expected blood system of monitoring pressure of manufacturers including a pressure sensor coupled to the patient's body to measure your blood pressure, a filter to mitigate virtually any undesirable high frequency components, and a peak detector, a detector minimum and a peak detector on average, respectively, for determining systolic pressure, diastolic and mean arterial pressure patients. A switch selectively couples the output of the detectors subjected to an oscillator whose output frequency depends on the input signal which is applied. The output of the oscillator is selectively blocks through a circuit in a meter, a clock signal generated by a circuit clock, the period of the trigger signal is set depends on the frequency of the oscillator output as a result of the pressure detection pressure higher interest. Gated oscillator pulses are applied to a counter circuit for counting the number of pulses received and provide a corresponding output, output in turn is displayed as a digital display.

In an embodiment of this invention, the circuit clock provides a blocking signal for periodically transferring the account indicated by the derivative of the digital counter to a rate dependent slowing of the heartbeat you want to measure. For example, the heartbeat of an athlete in good physical condition is approximately 50 beats per minute, which is required sampling rate of about 1.5 seconds. Therefore, data is transferred to display media for a price and at the same time, peak and minimum peak detectors are reset to a tax. In this embodiment, a circuit free-running clock provides a closure or a clock signal for transferring data to display means and restore the maximum and a detector peak minimum.

In one embodiment of this invention, the threshold circuitry can be connected to the outputs of peak detectors and minimum trigger an alarm when the minimum pressure and maximum pressure is exceeded. In addition, the output of peak detector and the minimum can be associated with differentiation of measurement circuits of the exchange rate the minimum and maximum values for the alarms that can act.

In one embodiment of this invention, the maximum and minimum filtered signal are detected and stored separately in the sample and hold circuits for the voltage values systolic and diastolic href = "http://www.hospital-homecare.com/"> Pressure Monitor manufacturers of blood products. All of the sample and said holding patterns is coupled with a switch for the voltage controlled oscillator whose output is closed at a meter with a similar manner as described above. The occurrence of each maximum and minimum output pressure sensor is used to start a clock circuit provide a trigger pulse width output pulse selected to be substantially constant value for the maximal blood pressure interest and therefore the greatest number of pulses generated by the VCO. In addition, variable circuit closing clock adjustment is provided for the transfer have the meter display to digital display. The clock circuit closure may be adjusted to the desired length of the screen and output signals are applied only in the absence of a clock circuit tripping pulse. Systolic blood pressure is about 110 mm Hg to 150 mm Hg and diastolic blood pressure is about 70 mm Hg to 93 mm Hg in certain situations, abnormal systolic blood pressure can vary from 80 mm Hg to 200 mm Hg and diastolic blood pressure can vary from 55 mm Hg to 110 mm Hg Account Given these considerations, the full range of measurement desired pressure is 55 mm Hg to 200 mm Hg Adding an additional safety margin, total pressure range of interests that are regarded as 0 mm Hg 250 mm Hg

In Fig. Figure 2 shows the diagram of pressure pressure manufacturers to monitor a system, according to the teachings of this invention can measure and display Systolic, diastolic and mean in a range from 0 to about 250 mm Hg In particular, the system includes a pressure sensor 10 capable of providing power that varies linearly with pressure. The pressure transducer 10, usually shown in the figure. 2 is illustrated in Fig. 6, comprising a pressure transducer 96 of the type manufactured by National Semiconductor Corporation LX1601 designation Type G or D In practice, the transducer 96 is coupled to measure the blood pressure of a patient through a tube 82 having one end that is connected to a needle or catheter 80 to be inserted into the vessel of a patient. A saline may be introduced through port 88 to provide a fluid path of blood from the patient to the transducer 96. The other end of the tube 82 is coupled to a gearbox 84 through an input port 86. Blood pressure is coupled to a membrane 90 of the saline solution by a second membrane 92 by a non-compressible, non-conductive liquid medium 94, such as silicone oil, contained in a housing 95 for transducer 96. In particular, the pressure against the 90 membrane is transferred through the membrane from 92 to 94 seconds of fluid that exerts pressure to turn the transducer 96 to provide an output indicative thereof. A flange annular shape 89 extends downward from the housing 84 and has a number of threads loans in the inner periphery thereof. By cooperating, housing 95 has a series of discussions on the outer periphery thereof whereby the housing 84 may be screwed to the housing 95. Accordingly, after pressure a patient's blood was measured, the box 84 may simply be removed and destroyed, and a new housing coupled screwed respect to the transducer 96. In addition, the second membrane 92 is supported by an annular element 91 fixed to the inner periphery of housing 95, which provide the membrane 92 in intimate contact with the membrane 90, when housing 84 is secured to the housing 95. As mentioned above, the sensor output 96 varies linearly with changes in pressure 0 mm Hg to 250 mm Hg, above National Semiconductor sensor is capable of providing a linear output of 1.5 percent over the range with a sensitivity of 19.34mV/mmHg. As shown in Fig. 1, the output of the known transducer 96 varies from 7.5 V to 12.5 V for a change in blood pressure.

The output of transducer 10 applies pressure to a filter 12 to eliminate some unwanted high frequency components thereof. To determine the frequency content desired signal that is monitored, there are two assumptions: (1) The fundamental frequency is an important element, and (2) the upper limit Frequency is on harmonic n maximum heart rate achieved. Harmonics n is chosen as a compromise between noise rejection and attenuation signal to be measured. The worst situation referred for ventricular tachycardia, when the heart rate up to about 250 beats per minute occurs. By vary the selected harmonics of the fundamental frequency results in a corresponding change in the setpoint of the filter and the amount of mitigation signal by the filter. For example, when maximum heart rate is fixed at 250 beats per minute, the fundamental frequency of the pressure curve is In setting of 4.17 Hz the upper limit of the seventh harmonic frequency, approximately 95% of the signal passes through the filter, and the resulting point set of filters is fixed to 29.19Hz. If the set point filter is set at the tenth harmonic of the fundamental frequency, approximately 96% of energy is obtained and the reference filter filter 12 is 41.7Hz.

In one embodiment of this invention, it is desirable to allow adjustment of the maximum frequency passes through the filter 12. As explained in greater detail with respect to FIG. 4A, filter 12 includes resistors R1 and R2, which may be strong variable, that the reference frequency filter 12 can be adjusted. Thus, the operator could set the filter 12 point filter based on intrinsic rate of the patient. For example, if the intrinsic heart rate of patients was 60 beats per minute (1 Hz), the set point in the seventh harmonic filter is 7Hz. Similarly, for an intrinsic rate of 120 per minute (2 Hz), the setpoint filter is set at 14Hz for the seventh harmonic frequency fundamental. In addition, the output of the transducer 10 may contain high frequency components of motion artifacts catheter unnoticed. For all variable frequency Maximum filter 12, the signal-to-nose can be reduced, the high frequency components of catheter movement can be minimized.

The output Filter 12 is applied to each of a peak detector 14 and a minimum peak detector 16 and the detector average: 18, respectively, results provide information on systolic and diastolic blood pressure average of Blood pressure monitors manufacturers. As explained in detail below, the average detector 18 takes the form of an integrator for provide a signal indicative of the average patient's blood pressure according to equation (1), described above. A score of 14 detectors, 16 and 18 is applied by a switch 20 selectively provides one of the three points "a", "b" and "c" to the detector outputs Max Peak 14, the minimum peak detector 16 and the average detector 18, respectively, a voltage controlled oscillator 22, whose output frequency varies proportional to the amplitude of the input signal selected. Thus, in one embodiment of this invention, the oscillator output 22 is voltage controlled to vary from 0 to 1000 Hz for a corresponding output of pressure sensor 10 variables from 7.5 to 12.5 V. Therefore, a voltage VCO output 22 of 1000 Hz indicates a blood pressure of 258.5mm Hg and an output of 0 Hz indicates a measure of blood pressure 0 mm Hg

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It is therefore an object of this invention to provide a new and improved system for  blood pressure monitor manufacturers and in particular the systolic, diastolic and mean blood pressures.