Time to replace sand?

[jonno]

Thanks Ben - I'll up the dose to 9 gallons starting with this evening's dose.
FC 2.5 (first time I've seen FC in a while)
CC 2.0
pH 7.3 I switched back to muriatic acid this morning.
TA 190-200

[jonno]

Evening numbers:
FC 0.5
CC 1.5
pH 7.2 (put in more m. acid)
TA 180

Tonight the dosage increased to 9 gallons of 6% bleach - water is quite green, visibility about 20"
Ordered a couple 5 gal carboys from Uline and found a local cleaning supply that sells 12.5% bleach for $2.75/gal. so I can keep up the dosage until the water clears - it will seem like alchemy when it does!

[jonno]

Morning report:
FC 10.5
CC 2.5
pH 7.2 (added more acid)
TA 190
Water still green with low visibility.