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- Forgot to insert membrane into its housing —> Put membrane into housing.
- Membrane is inserted incorrectly —> Re-insert membrane correctly. See Fig.14B, page 20.
- Water pressure too low, causing TDS to be higher than usual —> Raise water pressure or
add pump to RO.
- Input source water has very high TDS and/or contains certain heavy dissolved elements
resulting in TDS higher than usual.
- Waste water flow is restricted or clogged —> Check and re-align the drain saddle and
drain line.
- Your input water’s TDS fluctuates resulting in high “composite” TDS in the holding tank —>
To verify this, test the filtered water’s TDS before it enters the tank. Do test as follows:
8) TDS (Total Dissolved Solids) Level Reads Higher Than Normal
How to test TDS correctly:
See “TDS Meter -- How to Test Your Water Quality” instructions on
page 24.
If the filtered water’s TDS reads higher than the normal 10% range, these are the possible
causes:
Test#2: Test Check Valve and ASO valve:
- Make sure there is some water in the tank (tank not empty).
- Remove the Black drain line from the drain saddle (so you can check waste flow drainage).
- Turn OFF the Cold feed water supply.
- Turn ON the tank valve.
- Check the Black drain line to see if there is any water draining out from this line.
- If water does drain out from the black line --> Then this water is coming from the storage
tank. This means the Check Valve is broken, it is allowing the water in the tank to back flow
out into the drain line.
Solution: Replace Check Valve ( see Fig.16 point E )
- If no water drains out from the black line (no waste water running) --> That means the
Check Valve is OK. The RO’s non-shut off is caused by a defective ASO valve, not caused
by the Check Valve.
Solution: Replace ASO valve ( located at Fig.16 point C )
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