Self-replacement of filters in the Atoll reverse osmosis system: instructions for

Why Atoll filters require regular replacement and what happens if you ignore the deadlines

Reverse osmosis systems Aquaphor Atoll (and their analogues under the brand Atoll) purify water at the molecular level, removing up to 99% of impurities - from chlorine and heavy metals to viruses and pesticides. But the effectiveness of such cleaning directly depends on the condition of the filter elements. Over time, the pores of the membrane and sorbents become clogged, and bactericidal additives lose activity. If you do not change the cartridges on time, the system will not only stop purifying the water, but will itself become a source of secondary pollution.

Manufacturer indicates recommended replacement times for each filter, but the actual interval depends on the quality of the source water and the intensity of use. For example, in regions with a high content of iron or manganese, mechanical pre-filters may fail after 2-3 months instead of the stated 6. And a reverse osmosis membrane designed for 2-3 years will last no more than 18 months with regular use and hard water. Ignoring the replacement of filters leads to a decrease in water pressure by 30–50%, deterioration of taste and even the risk of poisoning by microbes accumulated in old cartridges.

In this article you will find:

• 🔧 Step-by-step instructions for replacement all 5 filters (including membrane and post filter) with photos and videos.
• 📅 Table of replacement periods for different models Atoll A-550, A-575, A-580 and their analogues.
• ⚠️ Typical errors that lead to leaks or system breakdown.
• 💡 Ways to extend the life of filters and save on consumables without compromising quality.

What filters are in the Atoll system and what is each responsible for?

Classic scheme Atoll with reverse osmosis includes 5 stages of purification. Each filter performs its role, and skipping replacement of even one of them negates the work of the entire system. Let's figure out which cartridges are located where and what will happen if you don't change them:

stage	Filter type	Purpose	Consequences of delay
1	Polypropylene 5 microns	Removes rust, sand, silt	Clogs the membrane, reduces pressure
2	Coal granular	Absorbs chlorine, organic matter, odors	Chlorine destroys the membrane, the water smells like a swamp
3	Pressed coal (block)	Fine cleaning from chemical impurities	Water tastes like plastic or medicine
4	Reverse osmosis membrane	Removes 99% of salts, viruses, bacteria	Leaks, reduction in cleaning quality up to 40%
5	Post-filter (carbon or mineralizer)	Improves taste, saturates water with minerals	The water becomes “empty” or tastes bitter

In models Atoll A-575M and A-580M instead of a standard post-filter it is used mineralizer, which saturates water with calcium and magnesium. Its resource is shorter - only 6-8 months, but replacement cannot be ignored: over time, minerals begin to wash out uncontrollably, and the water becomes oversaturated with salts.

When to change filters: timing and signs of wear

Manufacturer indicates average terms replacements, but in reality they depend on:

• 💧 Source water quality (hardness, iron content, bleach).
• 📊 Usage intensity (a family of 4 wears out filters 2 times faster than 1-2 people).
• 🌡️ Water temperatures (hot water accelerates the degradation of carbon filters).

Estimated timing for systems Atoll:

• 🔹 1–3 steps: every 6 months (or after cleaning 3,000–5,000 liters).
• 🔹 Membrane (4th stage): 1.5–2 years (up to 10,000 liters).
• 🔹 Post-filter/mineralizer (5th stage): 8–12 months.

But how do you know when it’s time to change the filters? already nowwithout waiting for the deadline? Look out for these signs:

• ⚠️ Water pressure has decreased from the tap of clean water by more than 30%.
• ⚠️ Water has acquired smell of chlorine, rotten eggs or plastic.
• ⚠️ On a white coating appears on the membrane or flasks (calcium salts).
• ⚠️ The water has become cloudy or with sediment after settling.

⚠️ Attention: If after replacing the filters the pressure has not been restored, check water pressure (must be at least 2.8 atm). At low pressure, the reverse osmosis membrane does not work effectively, and the system will drain water into the drain with little or no treatment.

Step-by-step instructions: how to change filters in Atoll yourself

Replacing filters in the system Atoll does not require special skills, but it is important to follow sequence and hygiene rules. Prepare:

• 🔧 A set of new filters (suitable for your model).
• 🧼 Clean cloth or napkins.
• 💧 Container for draining water (bucket or basin).
• 🔨 Plastic key (included with the system) or adjustable wrench.

If you are changing filters for the first time, take a photo initial arrangement of flasks and the direction of the arrows on them - this will help to avoid errors during assembly.

Step 1: Turn off the system and drain the water

1. Shut off water supply tap at the entrance to the system (usually located under the sink).

2. Open clean water tap and allow any remaining liquid to drain from the storage tank.

3. Click on red button on the storage tank valve to relieve pressure (if there is no button, simply unscrew the hose from the tank).

Step 2: Replace filters 1–3 stages

1. Take plastic key from the kit and place it on the flask of the first filter. Turn counterclockwiseuntil the flask unscrews.

2. Remove the old cartridge and rinse the flask with warm water no detergents. Check the O-ring - if it is hardened or cracked, replace it.

3. Install the new filter, aligning it with groove in the flask. Screw the flask back on manually, then press with the key (do not over-tighten!).

4. Repeat the procedure for filters 2 and 3.

What to do if the flask does not unscrew?

If the flask gets stuck, wrap it in a towel for better grip and try again. Do not use metal tools - they may damage the plastic. As a last resort, gently tap the key with a rubber mallet, turning it counterclockwise.

Step 3: Replacing the membrane (4th stage)

The reverse osmosis membrane is the most expensive and capricious element. When replacing it:

1. Disconnect hoses from the membrane body (remember their location!).

2. Unscrew plastic cover housing (sometimes a key is required).

3. Take out the old membrane and rinse the body from the inside. Make sure the O-rings are in place.

4. Install a new membrane arrow up (the direction of water flow is indicated on the body).

5. Reconnect the hoses and check for leaks.

⚠️ Attention: Reverse osmosis membrane does not tolerate drying out. If the system has been idle without water for more than 2 weeks, soak the membrane in clean water for 1 hour before first use.

Step 4: Replacing the post-filter or mineralizer (5th stage)

The post-filter changes in the same way as the first three stages, but with one nuance:

- If you have Atoll A-575M or A-580M with mineralizer, do not rinse it with tap water - this will flush out the minerals. Simply shake off the dust and install a new cartridge.

— After replacing the post-filter be sure to flush the system (see next step).

Step 5: Flush the system after replacement

1. Turn on the water supply and allow the system to fill the storage tank.

2. Drain the first 10–15 liters water - this will remove carbon dust and air from the new filters.

3. Check all connections for leaks. If it drips somewhere, tighten the flask or check the seal.

Typical mistakes when replacing Atoll filters and how to avoid them

Even experienced users sometimes make mistakes that lead to leaks or system failure. Here are the most common:

• 🔧 Dragging the flasks - leads to cracks in the plastic or deformation of the seals. Screw the flasks by hand, and just press with the key.
• 💦 Ignoring flushing after replacement, carbon dust from the new filters gets into the water and spoils its taste.
• 🔄 Confusion with hoses when replacing the membrane - if you mix up the inlet/outlet, the system will drain water into the drain without cleaning.
• 🧴 Using Lubricant for sealing rings - this leads to swelling of the rubber and leaks. The rings must be dry!

Another common problem is incorrect choice of filters. For example, installing a cheap analogue membrane with low selectivity (for example, 90% instead of 98%) will lead to salts and nitrates penetrating into the water. Always check the label:

• 🔹 The membrane must indicate: TFC 50/100 GPD (for Atoll 50 or 75 GPD is suitable).
• 🔹 The post filter must be labeled as CTO (coal) or Mineral (mineralizer).

How to save money on filters without sacrificing quality

Original consumables Atoll are expensive, but there are ways to cut costs without risking your health:

• 💰 Buy filter kits (1-3 steps + post-filter) - it’s cheaper than buying cartridges separately.
• 🔄 Rinse the membrane Once every 6 months with a special solution (for example, Aquaphor RO-Cleaner). This will extend her life by 20–30%.
• 🛒 Look for analogues from trusted brands: Geyser, Barrier, Aquafilter. The main thing is matching in size and type of cleaning.
• 📦 Order in bulk - if you have several systems (for example, in a country house and in an apartment), purchasing 2-3 replacements in advance is cheaper.

But there are things that you can't save money:

• ❌ Reverse osmosis membrane - cheap analogues often have low selectivity and allow harmful impurities to pass through.
• ❌ O-rings - old or poor quality lead to leaks.
• ❌ Postfilter - if it has exhausted its service life, the water will be tasteless or taste like plastic.

Average cost of an original set of filters for Atoll A-550 (1–5 steps) - about 3,000–4,000 rubles. With proper care and washing of the membrane, this set will last a year, that is less than 10 rubles per day for a family of 3-4 people.

Frequently asked questions about replacing Atoll filters

🔹 Is it possible to change filters not all at once, but one at a time?

Yes, but it's not practical. For example, if you replace only the membrane, but the pre-filters (1-3 stages) remain old, they will clog the new membrane 2-3 times faster. It is optimal to change 1–3 steps at a time, membrane - as it wears out, post-filter - once every 8-12 months.

🔹 How to understand that the reverse osmosis membrane has failed?

Signs of a faulty membrane:

• The quality of the water has decreased (a taste of salt or metal has appeared).
• The flow into the drainage has increased (the ratio of clean water to waste is worse than 1:4).
• The water pressure from the tap dropped by more than 50%.

Check the membrane for leaks: disconnect the clean water hose and see if water flows from the drainage hole when the tap is closed. If it leaks, the membrane is broken.

🔹 Is it necessary to sterilize the system after replacing the filters?

If you use the system regularly and change filters on time, sterilization is not required. However, if:

• The system stood idle without water for more than 2 weeks,
• Have you noticed mucus or mold in the flasks?
• The water has acquired a musty smell,

then flush the system with a solution food grade hydrogen peroxide (3%) or a special tool like Aquaphor Disinfector. After disinfection, thoroughly rinse the system with clean water (at least 20 liters).

🔹 Can I use filters from other brands in Atoll?

Yes, if they match:

• 🔹 Size (standard flasks for Atoll - 10" or 20" inches).
• 🔹 Type of cleaning (for example, the coal block should be pressed, not granular).
• 🔹 Productivity (membrane should be 50 or 75 GPD).

Suitable analogues:

• 1st stage: Geyser 1PP 5 microns or Barrier PP5.
• 2–3 stage: Aquafilter CTO or Honeywell FF06.
• Membrane: Filmtec TW30-1812-50.

🔹 How much water should be drained after replacing filters?

Minimum 10–15 liters (for systems with a storage tank of 8–12 liters). If the tank is larger (for example, 18 liters), drain 20–25 liters. This is necessary for:

• Removing carbon dust from new filters.
• Displacing air from the system.
• Stabilization of membrane operation.

If after rinsing the water is still cloudy or has bubbles, drain another 5-10 liters.