I would still suggest if possible that your sump has a overflow to a drain. this way anything you add will be displaced to the drain. you could then have a bucket with a pump on a timer and your good. the stenner pump used on daplatapus system is definitely pricey but also a good way to do it
https://youtu.be/fUeKYgbGdgU
this was a year ago when I first setup this freshwater. tank I have not done a water change ever
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150 gallon reef mostly softies/lps. 50 gal sump with bubble magnus skimmer/ Led fuge light/refugium/ 1200 return and tunze powerheads. Dual pharoah main tank led.4 pump dosser.
550 gallon stingray tank water drip system
150 bowfront. 75 turtle tank, many others
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