I fell into the trap of getting salinity wrong. At 16C a salinity of 1.026 is required. The average salinity around Britain is 1.025 but the western coast is slightly saltier.
I collected my sea water from the ferry slipway at Sandbanks in Poole on an incoming tide, even so the salinity was only 1.023 and I had to boost it slightly with a saltwater mix.
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