CAPACITY TO REDUCE TOTAL DISSOLVED SOLIDS (TDS) LEVELS IN THE IMPLEMENTATION OF ERGONOMIC WATER KNOCK FILTERS

Clean water is very important for life. Provision of clean water is still a problem in Indonesia. 80% of Indonesia's population still consumes water that is not in accordance with health standards. Whether ergonomic water filters knock down for clean water supply is the consumer's interest in water users. This ergonomic knock down water filter all parts are easily removed, carried easily, then reassembled where the location requires water as long as there are waterways to get clean water. The design of this study is comparative and experimental descriptive. Large sample of 30 people who use water filters. Place of Research in the Industrial Engineering Ergonomics Laboratory, PGRI AdiBuana University Surabaya, Indonesia. Data is taken by observation, questionnaire, and experimental results. Data were analyzed using descriptive percentages. The results showed that 73.3% water filter material chose stainless steel. Ergonomic knock down water filters have the ability to reduce levels of total dissolved solids (TDS) from 380 ppm to 156 ppm, down 224 ppm (41%). Conclusions: 1) water filter users have the highest interest in choosing filters made of stainless steel, are easily installed and used ergonomically, and anti-oxidation does not cause corrosion; 2) the water yield from ergonomic knock down water fliter is 41% clearer than before filtering. Suggestion: To implement the Quality Function Deployment of a knock down water filter, ergonomics are expected to be guided by analytical analysis according to the conclusions above.


INTRODUCTION
Water is a chemical compound H2O which is very important for human life and other living things. The function of water for life cannot be replaced by other compounds. Almost all activities carried out by humans need water. For bathing, cleaning the floor, cooking, drinking, washing dishes, washing clothes and others need water. Of course the water needed is clean water. The results of research from the World Bank's water and sanitation consultant (Utamawaterfilter, 2014-2018) stated that until 2017, there were around 100 million people in Indonesia, with around 80% still consuming water that was not in accordance with health standards. Clean water supply aside from sources, procurement also requires tools. Ergonomic filters knok down the water purifier as an alternative water purifier needs to be developed. This is so that there will be no difficulty in obtaining and procuring clean water.
Government Regulation No.20 of 1990 classifies water quality into several categories according to their designation. The classification of water according to its designation is as follows. 1. Group A, which is water that can be used as drinking water directly, without prior treatment. 2. Group B, which is water that can be used as raw water for drinking water. 3. Group C, which is water that can be used for fisheries and animal husbandry purposes. 4. Group D, i.e. water that can be used for agriculture, urban business, industrial, and hydroelectric power. (Effendi H, 2003).
Water needs in life are mostly obtained from groundwater and river sources. Surface water is found in lakes, rivers and other water sources. While ground water (ground water), is found in the soil.
Groundwater can dissolve the parent material minerals from the soil it passes through. Most of the microorganisms that were originally present in ground water are gradually filtered out as water seeps in the soil. The water used by humans is fresh surface water and pure ground water (Rukaesih quoted by Nicola, 2015). Ground water is water that is below the surface of the land. The main characteristics that distinguish groundwater and surface water are the very slow movement of groundwater and very long residence time, which can reach tens or even hundreds of years (Effen in Nicola, 2015).
Mackereth in Nicola, (2015). Conductivity is expressed in units of µmhos / cm or µSiemens / cm. The value of electric conductivity (DHL) is closely related to the value of total dissolved solids (TDS). TDS is usually caused by inorganic materials in the form of ions which are commonly found in waters. TDS consists of mud, fine sand and microorganisms, which are mainly caused by soil erosion or soil erosion carried into water bodies. To reduce levels of TDS in pelu water, filtering / purification is carried out. One of them is with a simple water purifier or ergonomic knock down water purifier.Based on the initial observations of the TDS content when taking the initial data that is the TDS content above that is required. Therefore it is necessary to make a water purifier to reduce TDS levels. In this case, an ergonomic knock down filter model for water purification is made. This purifier can be installed in the bathroom or in the kitchen sink. This ergonomic water purifier is installed without damaging the installation of the installed water pipe. It is expected to save costs in terms of installation and in terms of the product.
According to Wignjosoebroto (1995) in Rahayu (2015) Ergonomics is a scientific discipline that studies humans in relation to their work. Ergonomics plays a role in product design and product innovation, both product development and the creation of new products. In making product designs it should refer to ergonomic principles. Ergonomics standards are the standards required for ergonomics design. Ergonomics standards include: anthropometric dimensions standards, physical environment, work climate, noise, and others (GempurSantoso, 2004). According to Diane (2014) states that one of the principles of ergonomics is to make sure all objects that are easy to use.
In the development of a product or tool by taking into account the level of interest of consumers whether the needs of water purifiers are needed by the public in terms of the broad is the consumer. Ergonomics-based product development really determines whether the product is made ergonomically, this assessment depends on consumers as users, and the ability of water filters in purifying water. Therefore, how is the water filter ergonomic knock down design implemented?; and how much capacity to reduce the level of total dissolved solids (TDS) of an ergonomic knock down water filter?

Data Collection Stage
The primary data collection was obtained by conducting a survey of the location of sampling well water to determine the level of TDS by measurement, and the distribution of questionnaires to users / consumers who will be carried out design development with 30 respondents. Secondary data were obtained from literature studies.

Data Processing and Analysis Stage
Data analysis in this study uses comparative descriptive and Quality Function Deployment (QFD), then designed and tested. QFD is used to obtain design models and designs that are ergonomic and in accordance with consumer demand. QFD is described by a matrix called "House of Quality" (HOQ) as in

Implementation of Ergonomic Filter Design
In determining the Quality Function Deployment based on consumer voices the results are as follows:

a. Technical Requirements Attributes
Technical requirment is the translation of consumer needs into technical languages. Technical requirements are obtained from interviews, document searches and group discussions with researchers who have the capability in terms of product design. Then get the Technical requirment information as follows (table 1).      Based on the analysis of planning above, it can be made in its implementation, see Figure 5 below.