The tm pro wcs at those % sound like a great plan.
IO is tried and true, I see no need to keep on with the tm pro- not that I think there’s anything wrong with tm pro. It’s probably fine as well but not necessary...
If you are up for 5% twice a week going forward, sounds good.. I also see nothing wrong with 10% once a week...
the 5% twice a week may be a bit better for parameter stability...
That why I built the In Sump Auto Water Changer.
It's designed for 5% Gallons Auto Changes, with Easy One Button Push.
10% means lugging out buckets again if I want to do in one shot.
The Auto Change, can only do 5% at time, then it takes a while for Compartment to mix into system.
So it will be 5% twice a week after TMP runs out.
Also the smaller 5% will be a more gradual transition to IO.
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One last question. About the
Salinity increase method. (If needed).
What I used to do before to make it gradual, is I swapped out the Endless RO reservoir with a 5 Gal bucket of Mixed SALT Water.
As Evaporation TOP up happened, I didn't top up with pure RO, I topped up with 1.0142 Water , and slowly the Salinity would increase.
This calculator made it safe and easy, and ACCURATE. (Salinity Increase)
https://www.hamzasreef.com/Contents/Calculators/SaltwaterTopOff.php
Example: SGcurrent=1.023 SGtarget=1.025 TOP off Amount=14Gallons (1 Gallon per day, 2 weeks).
Thus Topping up with 1.0142 Water, would raise Salinity from 1.023 to 1.025 in two weeks (With 1 Gallon Top off per day)
Of course I would check daily, and only refill the 5 Gallon Top manually.