Saltwater pH line and checking the marine box on SCA

If you have a marine fish only tank or a reef tank your PH readings will need to done via the marine PH line calculation.

If you do not tick the box PH will appear incorrect and normally high by a few points. All PH test systems are affected by the buffering capacity of the water they are in, and this is why all PH systems need to be corrected for KH. Normally in salt water the buffer capacity is very high and constant.

You can still use trim on PH and other parameters after checking the box.

To use the correct PH line and calculations follow these step by step instructions below.