Repotting cattleyas

[Dani8]

Because the ro water takes a long time to fill a bucket, I just water from the top as much as needed so the medium is wet, but there's no more than 1cm water in the tray. With the leca/seramis it works.
I can't use the shower or sink because water at all taps is softened and the ro water is collected in a watering can but takes 1 hour per 10 Liter watering can. So I can't afford making a lot of ro water to then throw down the drain if you understand.