Anyone using a peristaltic pump for top-offs?

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I reviewed the different options for top-off (float switch, float valve, DIY nurse, Tunze osmolator, etc) and I'm thinking I'll go with a peristaltic pump set at a fixed rate to attempt to match my evaporation rate, if this doesn't work I can always hook it up to a float switch. Probably use it to does kalk as the top-off water.

Anyway I'm wondering who uses these peristaltic pumps and what people's experiences are with them.