While on the Pozzani site to re-order nitrate reduction cartriges I spotted this https://www.pozzani.co.uk/product_info.php?products_id=184. I bought a cartridge to try since I am already filtering my tap water so its no additional effore or time..
Tonight I did my usual 100 litre change (180 litres in the tank) and after the water change my readings (using JBL strips) were:
GH: 16d
KH: 20d
pH: 8 (these are all what I expected them to be)
Then I filtered another 25 litres using the softening filter in addition to the nitrate and carbon filters. I haven't put this into the tank but in the bucket the tests showed:
GH: 4d
KH: 18d (midway between 16 & 20)
pH: 7
Does that make sense? I would have expected the KH to drop by more given how much the GH dropped. pH was straight out of the tap so I'll check that again in the morning once it has stood overnight.
Tonight I did my usual 100 litre change (180 litres in the tank) and after the water change my readings (using JBL strips) were:
GH: 16d
KH: 20d
pH: 8 (these are all what I expected them to be)
Then I filtered another 25 litres using the softening filter in addition to the nitrate and carbon filters. I haven't put this into the tank but in the bucket the tests showed:
GH: 4d
KH: 18d (midway between 16 & 20)
pH: 7
Does that make sense? I would have expected the KH to drop by more given how much the GH dropped. pH was straight out of the tap so I'll check that again in the morning once it has stood overnight.