If you have just installed the filter or have been using it for several years and no water is coming out of it or filling the tank, one of the most likely reasons for this is the pressure in the osmosis tank. Today we will figure out what it should be and what to do about it.

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Water leakage from the nipple when unscrewing indicates a rupture of the membrane between the air and water chambers. In this case, the tank is not serviceable and needs to be replaced.

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This operation is also not difficult to perform - you will need a car compressor or a hand pump. It is important to pump air slowly and smoothly, with intermediate pressure measurements. The most convenient way to do this is to use a pressure gauge integrated into the pump. Do not try to get the maximum reading, as this may cause the tank membrane to rupture.

If the pressure is normal, then you should return to finding the causes of the malfunction, if it is below 0.4 atm, you need to pump it up.

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On October 10, the NALC Executive Council met in Washington, DC to consider a charge initiated by an NALC member against Region 9 National Business Agent Eddie Davidson.

The National Association of Letter Carriers, AFL-CIO and the United States Postal Service have reached tentative agreement on a new collective-bargaining agreement for city letter carriers

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Usually in a new tank the pressure is set exactly according to these indicators, but it happens that during transportation, service or other manipulations it shifts, in which case it must be measured and equalized.

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If you have noticed that something is wrong with the filter and have ruled out other problems, it is worth checking the pressure in the tank; if the service is performed by a service engineer, we recommend asking them to check and set the pressure.

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If you have performed all the manipulations and the water does not come out of the filter, you will have to look for another reason. Among the main ones are:

Selected articles for city carrier assistants from The Postal Record, one of the best tools to help you make the most of your membership.

NALC is deeply saddened to learn of the passing of former South Jersey Branch 908 President Steve Lipski on October 20, 2024.

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NALC’s Letter Carrier Resource Guide is a one-stop shop for valuable information for all city letter carriers at every stage of their career.

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On October 10, the NALC Executive Council met in Washington, DC to consider a charge initiated by an NALC member against Region 9 National Business Agent Eddie Davidson.

The normal pressure in the reverse osmosis tank is 0.4 - 0.6 atm. Values higher and lower than these indicators indicate that the filter will not work effectively.

Structurally, it is a plastic or metal housing, inside which there are two chambers separated by a membrane made of flexible polymer. During operation, the upper chamber is filled with water, while the lower chamber maintains the required pressure slightly below atmospheric pressure to ensure the suction effect.

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The membrane element of a household filter typically delivers 8 to 12 liters of purified water per hour. The process is gradual. The tank of the reverse osmosis system plays the role of a storage tank to ensure a uniform supply of the required amount of water.

NALC has created a comprehensive summary of the terms of the tentative agreement reached with the United States Postal Service.

This article explains how to diagnose and fix pressure issues in a reverse osmosis (RO) tank. It covers the correct pressure range (0.4 - 0.6 atm), checking and adjusting pressure, common causes of pressure drops, and solutions for leaks, membrane issues, and low water supply pressure.