I have never?used the pool solution but it is good to know where to look for large volumes at less than sky high prices.
A quick google indicates that adding a little NCl table salt, to the mixture?should cause the?AgNO3
AgNO3 into AgCl and NaNO3. The AgCl precipitates out, but the ClNO3 is very soluble?and therefore?hard to get rid of. I couldn't find any information on how it might effect of the sodium nitrate on the etching process and the stuff is soluble?in water you would probably have less trouble trying to remove the copper than the sodium.