I would not really want to drop that much alk in 48 hours you should have just reduced the drip rate by 25-50 % and adjust over time slowly.
Only bad things happen fast in reefing.
Depending on water volume, and effluent output I am surprised your alk fell 4 dKH in 24 hours.
My tank is 125 gallon system with effluent drip rate of 55-60ml/min with effluent pH of 6.55. My outlet to the sump from the Ca Reactor has a tap to control the effluent drip rate and becomes plugged from time to time . Once i forgot to check it and only lost 1 dKH in 7 days.
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265G 40G sump, 3X250W 15000K, T5 Actinics, Marine Tech 600 NW w Sanders 200mg/H ozonizer,Dart w/ OM 4 way, Vortech Mp40,Tunze wavebox,Calcium reactor, Fauna Marin low nutrient system.
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