Nitrite is an absolute pain if it gets out of hand , normally new ponds and weak filters play apart in it but i made mistake once of topping water up 10% water changes sometimes more and my dechorinator had stopped working so every time i water changed i was getting chlorine in water killing filters off id check chlorine to
One of the reasons we always top the ponds up very slowly and make sure the fresh water enters tge pond away from the filter media. Flow rates play a massive part when using dechlorinators and we are happy with a strong drip 👍
