Ecco cosa dice la casa che produce il Protalon in merito al cambio d'aqua dopo la cura, spero così di chiarire tutti i dubbi in merito al protalon con una fonte ufficale
as the cure is 7 days, you can change water at day 8. But this is only
nessecary when you are close to your regular waterchange or when you
have a
lot of dead algae after the cure is done. We advice to check your water
with a tester (like the eSHa Aqua Quick Test)
At day 8 you also can filter over fresh active carbon to remove the
active ingredients of Protalon 707. After this you can use fertilizers
again.
You can find more info about our products, including Protalon 707 on
our website
http://www.eshalabs.eu/pages_eu/advies_engels.html
Kind regards,
Suzanne
eSHa Labs