Clean It Up
UK Window Cleaning Forum => Window Cleaning Forum => Topic started by: Andrew4444 on February 24, 2026, 06:54:44 pm
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I've noticed my domestic water supply has a much higher TDS reading than usual. For past 15 years its been 320 to 340 INCOMING but now it 750 to 800 !!
I've tested my neighbours and she has the same high reading so it can't be an isolated issue within my house.
RO is brining it down to 15 (usually 7 or 8) so its doing its job but has anyone else ever noticed a very sharp rise in TDS for incoming water supply??
Could it be the heavy rains that has caused this?
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Your water company may have changed where they get your water from.
My water used to be 050 but jumped to 350. The water company changed the supply from surface water (a reservoir) to ground water (boreholes). I’d check with your water company.
Where in the country are you?
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Thanks. I will check.
I'm in st.ives but cambs one not cornwall.
Near huntingdon
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Thanks. I will check.
I'm in st.ives but cambs one not cornwall.
Near huntingdon
I'm on the north west edge of Bristol and get supplied by Bristol Water. They use Chew Valley reservoirs in North Somerset AND draw off water from the Sharpness Canal in Gloucestershire which is fed by the River Severn.
I find after a lot of rain my tds DROPS. I've been window cleaning WFP from here since 2005 and the pattern is as follows -
After a lot of rainy days Input TDS250/300 output 4-6ppm. After a dry spell, Input TDS 350 plus output 7-9ppm.
I use an old Merlin type PRF R/O with the uprated membranes.
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Thanks. I will check.
I'm in st.ives but cambs one not cornwall.
Near huntingdon
St Ives Cornwall has a reading of between 85-95 usually we do a few hotels there
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Thanks. I will check.
I'm in st.ives but cambs one not cornwall.
Near huntingdon
I'm on the north west edge of Bristol and get supplied by Bristol Water. They use Chew Valley reservoirs in North Somerset AND draw off water from the Sharpness Canal in Gloucestershire which is fed by the River Severn.
I find after a lot of rain my tds DROPS. I've been window cleaning WFP from here since 2005 and the pattern is as follows -
After a lot of rainy days Input TDS250/300 output 4-6ppm. After a dry spell, Input TDS 350 plus output 7-9ppm.
I use an old Merlin type PRF R/O with the uprated membranes.
We used to do a bit of work in Bristol and the reading was 450-475
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Thanks. I will check.
I'm in st.ives but cambs one not cornwall.
Near huntingdon
I'm on the north west edge of Bristol and get supplied by Bristol Water. They use Chew Valley reservoirs in North Somerset AND draw off water from the Sharpness Canal in Gloucestershire which is fed by the River Severn.
I find after a lot of rain my tds DROPS. I've been window cleaning WFP from here since 2005 and the pattern is as follows -
After a lot of rainy days Input TDS250/300 output 4-6ppm. After a dry spell, Input TDS 350 plus output 7-9ppm.
I use an old Merlin type PRF R/O with the uprated membranes.
We used to do a bit of work in Bristol and the reading was 450-475
Wow! It is certainly higher because of all the limestone around Bristol. In general terms When you are getting water via the reservoirs from the Mendips it is higher. I don't recall mine ever going above 400. Never lower than 250 either.
Maybe because I am on the NW edge I get more of mine from Purton on the Severn/Sharpness side rather than the Southern side of Bristol? So mine is a bit lower overall?
My water pressure is good - normally between 60 and 65psi naturally so that helps the output.
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Wow 800ppm is dangerous high for tap water. Must be an issue
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Thanks. I will check.
I'm in st.ives but cambs one not cornwall.
Near huntingdon
I'm on the north west edge of Bristol and get supplied by Bristol Water. They use Chew Valley reservoirs in North Somerset AND draw off water from the Sharpness Canal in Gloucestershire which is fed by the River Severn.
I find after a lot of rain my tds DROPS. I've been window cleaning WFP from here since 2005 and the pattern is as follows -
After a lot of rainy days Input TDS250/300 output 4-6ppm. After a dry spell, Input TDS 350 plus output 7-9ppm.
I use an old Merlin type PRF R/O with the uprated membranes.
We used to do a bit of work in Bristol and the reading was 450-475
Wow! It is certainly higher because of all the limestone around Bristol. In general terms When you are getting water via the reservoirs from the Mendips it is higher. I don't recall mine ever going above 400. Never lower than 250 either.
Maybe because I am on the NW edge I get more of mine from Purton on the Severn/Sharpness side rather than the Southern side of Bristol? So mine is a bit lower overall?
My water pressure is good - normally between 60 and 65psi naturally so that helps the output.
We used to fill up at a job in soundwell road and another in rough old fishponds 😂