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What is in water changes

BarryH

Member
Joined
25 Feb 2017
Messages
608
Location
Derbyshire
I change the water in my large goldfish tanks every week and I use the "dirty" water on the plants in my garden.

If it's not to daft a question, can anyone tell me what will be in the old water such as fish poo, dying plant matter etc. I'm asking because my plants do really well and a fellow gardener has asked if he could buy a fertiliser for his garden that had the same or similar ingredients as the old tank water.
 
My front lawn is quite lusciously green in the semicircular patch the fish tank waste water hosepipe reaches via the window.
 
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