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Polypropylene materials are mostly thick-walled and pressure-resistant materials. Therefore, it

is suitable to be used in compressed air line. In the assembly of this material, by using a
special heating apparatus, the two ends of the pipes to be joined can be melted at high

temperature and they can be joined.

While calculating the system piping and pipe diameter, it is important to determine in advance
the amount of water to be circulated daily in the closed circuit. In a system where there are

five fish tanks and each has a 50mm diameter water discharge, the pipe through which the

water from these tanks is collected must be at least 90-110mm. Getting help from experts
during the system installation will minimize possible errors.

6.9. Water Quality Measurement Devices

6.9.1. pH meter

In the geothermal system, pH, which is an important and critical parameter for both fish and
bacteria, should be measured and recorded on a daily basis. Materials that work with 3

different methods for pH measurement are sold in the market. The simplest of these and the

one that can be used in amateur geothermal systems is pH measurement with a solution. It is
possible to approximately measure the pH in the water by comparing the color that will be

formed by dropping a certain amount of pH measurement solution into a small amount of
sample water taken from the water with the color scale in the color chart supplied with the kit.

Although approximate values can be determined by performing this process with chemical
analysis sets, daily pH measurements with a pH meter will provide both economical and more

accurate results in the long run. pH meters are devices that require constant maintenance and

calibration from time to time. It is necessary to thoroughly read and understand the user
manual of the purchased device and to follow the directions in the manual. The pH meter

probe (measuring part) must remain in a moist or special solution. Otherwise, the
functionality of the probe will decrease over time and will need to be replaced. Another

simple pH measurement method is pen pH meters. These more economical devices have a
shorter lifespan and lower sensitivity.

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