I suspect that it is still leeching back out from the rocks and substrate, but I didn't think it would be this substantial in a 14g system volume tank. Tank sat for a year without testing, feeding TDO pellets to my clowns and a pair of BTAs.
14g water volume, hanna ulr po4
1/31 9.5g and 3g WC
2/1 8g WC, ICP sample taken immediately after, 0.02ppm results
2/6 first test 0.45ppm
2/7 1/3c Phosguard added to reactor, 8g WC, 0.20ppm, 2g WC
2/8 0.19ppm
I don't understand the 0.01ppm drop after 24hrs of Phosguard. That's within the margin of error. Have I really bound up that much Po4 in the system?
14g water volume, hanna ulr po4
1/31 9.5g and 3g WC
2/1 8g WC, ICP sample taken immediately after, 0.02ppm results
2/6 first test 0.45ppm
2/7 1/3c Phosguard added to reactor, 8g WC, 0.20ppm, 2g WC
2/8 0.19ppm
I don't understand the 0.01ppm drop after 24hrs of Phosguard. That's within the margin of error. Have I really bound up that much Po4 in the system?