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there are few factors that you will need to consider:
1. whether chroline or chrolamine (sp?) is used in your tap water. If chrolamine is used, spraying don't do much to get them out of the water, and chroline is released slowly over a few days. The effect can be deadly if it is allowed to accumulate during this period. (mines uses chrolamine)
2. ppm of the chemical in 1. Some tap water companies use higher concentration (mine does)
3. the amount of water you are adding into your pond during this time period, in % of the total pond volumn
For me, I will definately add dechro if I replace 10% or more water in my pond, at 1.5X the recommended dosage. 5% is where I may or may not add dechro.
stan
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