Installing & Operating
your Model 77 Countertop Filter


Thanks for buying our Model 77 Countertop water filter. It's a product we're proud of, and for a long time we've been calling it "the world's greatest $77 water filter."

The following pages tell you how to install it, how to use it, how to maintain it, and how to get it fixed if anything goes wrong. You'll like its easy-to-service features (you should never have to send it back—you can easily do any repairs yourself), the low cost of operation, and the fact that it has an absolute 100% lifetime guarantee.

How to Install the Model 77 (or our Double Countertop)

To install, unscrew the aerator from your sink faucet and attach the filter's diverter valve in its place. If it doesn't fit, use one of the enclosed adapters. The diverter valve will fit 90% of the faucets without an adapter, and the enclosed adapters will attach it to almost all others. For the 3% with an unusual thread pattern, consult a good hardware store, or feel free to call us.

To operate the filter, turn on the COLD water to a moderate flow rate, pull out the diverter valve stem, and water will eventually begin to flow through the filter. For initial operation, let the water run for four or five minutes before drinking. When the faucet is turned off, the valve stem will pop back into place and allow normal use of the sink faucet. Note: it may take as much as a day for all trapped air to work out of the new filter cartridge. If water dribbles from the end of the spout after the inlet water is turned off, or if water appears cloudy, the problem is trapped air. It will correct itself, and in the meantime, the water is safe to drink.

Do not run hot water through the filter.

Maintenance

Model 77 is designed to be trouble-free. However, diverter valves, no matter how good they are, sometimes become clogged with minerals from the water and begin to stick. The best regular maintenance you can do is to remove the diverter valve from the faucet about once a month and drop one or two drops of vegetable oil into the small hole where water enters the valve. Work the stem back and forth until it moves freely. This will add years to the life of the valve and insure smooth, trouble-free operation.

Leaks at fittings are rare and can usually be corrected by tightening the fitting or wrapping the treads with teflon tape. If the unit leaks at the bottom where the tower screws to the base, be sure the O ring in the tower is in place and screw the pieces together firmly. At annual cartridge change, lubricate the O-ring lightly. Silicone grease is the preferred lubricant, but petroleum jelly will work.

Warranty

This is the world's best and simplest guarantee. All parts of the Model 77 Countertop Water Filter (and our Double Countertop Filter) are guaranteed for life. Any part that fails will be replaced without cost for parts, labor, or shipping. The single exclusion from this guarantee is the replaceable filter cartridge.

Servicing your Model 77 Water Filter

Servicing a Model 77 consists mainly of changing its filter cartridge once a year. We have a record of the cartridge that was original equipment in your water filter and can ship it to you if you don't know its name or model number. The standard Model 77 uses a very the common 2.5" x 9.75" cartridge size. This means you can select from a large number of possible replacements for your unit. If you have the slimline or "Candle" version of Model 77, choose a cartridge from the "Candle Style" section of the same menu. Most Model 77 units use the MatriKX CTO+ or MatriKX Pb1 cartridges, which are available in both standard or candle sizes.


Remove the existing aerator
Attach Diverter valve to faucet threads
Pull diverter knob to start filter

How To Install Your Countertop Water Filter

This is a simple process.

Start by removing the aerator from your faucet. (See Figure A at right.) Usually you can take it off with your fingers. If needed, use pliers. It's a normal "right hand" thread. Remove by turning counterclockwise. Save the aerator. If you move your filter later, you'll need it.

Next, simply screw the diverter valve on in place of the aerator. It will screw right on to most faucets without a problem. Be sure the black washer is in place in the diverter valve. If the valve doesn't fit, use one of the adapters included with your filter. Probably it will be necessary to use one of the washers with the adapter.

Remember that in most cases you won't need an adapter; the diverter will attach directly to the faucet threads.

Place the filter beside the sink, and when you're ready, turn on the cold water. Start the filter by pulling out the small stem on the diverter valve. This will divert water through the filter. When you first start the filter, there will be a considerable delay while the filter fills with water. Eventually, water will come out of the filter's spout. On subsequent uses, water will come out of the filter immediately.

Let the filter run for four or five minutes to rinse the new cartridge and to drive as much air as possible from the filter. New filters (and old filters with newly replaced cartridges) hold much trapped air. Until the air is expelled (which sometimes takes a couple of days), the filter will not operate normally. You can drink the water, although it may appear cloudy and water may continue to dribble from the spout after the unit is turned off. Both conditions are the result of trapped air and will soon go away.

As water runs through the filter, the diverter valve remains opened. When the water is turned off, the valve will return automatically to closed position and you will have normal use of your sink.

Do not run hot water through the unit. It is designed to process cold water only.

To replace the cartridge:

  1. Open the filter by screwing the tower off of the base. It comes apart at the base and it's a standard thread pattern that loosens by turning left. It isn't practical to use a wrench on a countertop, so just muscle it apart. If you can't get it open, the best strategy is to get someone to help so that each person can use both hands. One person holds the base while the other screws off the tower. Sometimes units that have been in use for a long time are hard to open. If you can't get it, call us. We know some tricks that work.

  2. While the unit is open, it's a good idea to lubricate the black O-Ring that is in the groove of the tower of the filter vessel. Lubricate lightly with silicone grease, if you have some, or Vaseline if you don't. Silicone won't cause the O-Ring to deteriorate. Lubricating the O-Ring will make the unit come apart much easier when you service it next year, and it's much less likely to leak.

  3. Replace the cartridge. With open-end cartridges like the KX models, there is no up or down. Put it in either way. With standard-sized Model 77s, it's very important that the end gaskets don't fall off or get out of place during installation. The unit won't work properly if the end gaskets can't make a tight seal. With the candle style units, you obviously screw the threaded portion into the only place it will screw in–no way to go wrong on these–but don't over tighten, just get it snug.

  4. Reassemble by screwing the vessel back together. If the O-Ring is lubricated, just get it hand tight. Most leaks occur because the O-Ring buckles or is pinched when it is tightened. If it leaks, you can always tighten it a little more.

  5. After the unit is reassembled, run water through it to check for leaks. Allow it to run for a few minutes to rinse the new cartridge before using the water.

Servicing your Model 77 Water Filter

To replace the cartridge:

  1. Open the filter by screwing the tower off of the base. It comes apart at the base and it's a standard thread pattern that loosens by turning left. It isn't practical to use a wrench on a countertop, so just muscle it apart. If you can't get it open, the best strategy is to get someone to help so that each person can use both hands. One person holds the base while the other screws off the tower. Sometimes units that have been in use for a long time are hard to open. If you can't get it, call us. We know some tricks that work.

  2. While the unit is open, it's a good idea to lubricate the black o-ring that's in the groove of the tower of the filter vessel. Lubricate lightly with silicone grease, if you have some, or Vaseline if you don't. Silicone is much better and it won't cause the o-ring to deteriorate. Lubricating the o-ring will make the unit come apart much easier when you service it next year, and it's much less likely to leak.

  3. Replace the cartridge. With open-end cartridges like the standard carbon block cartridges, there is no up or down. Put it in either way. With "Media Style" cartridges, or with any closed cartridge with a plugged end, it will only fit the right way. If it goes in, you've got it right. Don't force it. With the candle style units, you screw the threaded portion into the only place it will screw in, no way to go wrong on these—but don't over tighten, just get it snug. With the larger models, it's very important that the end gaskets don't fall off or get out of place during installation. The unit won't work properly if the end gaskets can't make a tight seal.

  4. Reassemble by screwing the vessel back together. If the o-ring is lubricated, just get it hand tight. Most leaks occur because the o-ring buckles or is pinched when it is tightened. If it leaks, you can always tighten it a little more.

  5. After the unit is reassembled, run it and check for leaks. Allow it to run for a few minutes to rinse the new cartridge before using the water.

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