How to replace sampled water?

[arking_mark]

I would like to replace the water sampled by the KH Director with my 4th pump.

1. How much water do I need to replace?
2. How do I configure the 4th pump to replace the water at the right time?

[starmonkey77]

Re-hydrating this post.

I plan to return both the Vent and Waste Water to a waste container.

I plan to set the water sample to 80ml as standard and I aim to take two readings per day at set times, so a total of 160ml of sample water taken from the sump.

If I then use the 4th pump on the KH Director doser connected to a dosing container and stirrer to have the salt water mixed before each dose and dosed into the return pump chamber whilst the sample is being taken 80ml per measurement taken (water sample to be taken from the sump before the return chamber to gain accurate reading) how long should I expect the KHD to take to capture water sample from the sump? Or should I simply set the salt water dosing head to the same speed as the water sample dosing head?

How much water is expected to be taken to flush the KHD when operating 2 measurements per day?

Is there away to automate the replacement of salt water when the KH takes a water sample for measurements/flushes/manual actions etc?

Has anyone else run a similar setup to avoid fluctuating salinity levels?

Are there any concerns with this plan?