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Do you know rH ?


Melvyn Tan
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Hi All,

Came across an article on rH measurement being a better indicator of your water condition when you have both the Redox and pH value in your tank.

It goes like this;

rH = mV/29 + (2 x pH) + 6.67

So if your redox value is say 350 mV and pH is 8.2, then

rH = 350/29 + (2 x 8.2) + 6.67

results 12.07 + 16.4 + 6.67 = 35.14 rH

rH Value interpretation

0 to 9 - heavy reduction

0 to 17 - light reduction

8 to 25 - neutral

26 to 34 - light oxidation

35 to 42 - heavy oxidation

Anyone else have knowledge please contribute too...

My Beautiful ANGEL - Matsushima Nanako

Equipment List for 4x2x2 Tank & 3x1.5x1.5 Sump

Hagen 802 x 2, Tunze 6060, Arcadia T5 (54W x 8), Eheim 1260 (return) Eheim 1250 (Chiller), Aquabee 300 x 2 (Feed)

H&S 150-F2001 (850l Skimmer), H&S A110-F2000 (400l Skimmer), H&S 110-F1000 (1000l Sulphur/Nitrate Filter), H&S 150-F2000IA (800l Calcium Reactor)

Coralife 3X (UV Steriliser), I-Aquatic IF 312 (Fluidised Reactor), Kent Kalk Delivery, Resun CL650, Pinpoint ORP & PH Meters & Wireless Thermometer

4x2x2 Tank Thread

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Apparently higher values, as oxidation is desirous...

My Beautiful ANGEL - Matsushima Nanako

Equipment List for 4x2x2 Tank & 3x1.5x1.5 Sump

Hagen 802 x 2, Tunze 6060, Arcadia T5 (54W x 8), Eheim 1260 (return) Eheim 1250 (Chiller), Aquabee 300 x 2 (Feed)

H&S 150-F2001 (850l Skimmer), H&S A110-F2000 (400l Skimmer), H&S 110-F1000 (1000l Sulphur/Nitrate Filter), H&S 150-F2000IA (800l Calcium Reactor)

Coralife 3X (UV Steriliser), I-Aquatic IF 312 (Fluidised Reactor), Kent Kalk Delivery, Resun CL650, Pinpoint ORP & PH Meters & Wireless Thermometer

4x2x2 Tank Thread

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  • 2 months later...
  • SRC Member

No one else can contribute? Jervis Mun ??? hehhehe

My Beautiful ANGEL - Matsushima Nanako

Equipment List for 4x2x2 Tank & 3x1.5x1.5 Sump

Hagen 802 x 2, Tunze 6060, Arcadia T5 (54W x 8), Eheim 1260 (return) Eheim 1250 (Chiller), Aquabee 300 x 2 (Feed)

H&S 150-F2001 (850l Skimmer), H&S A110-F2000 (400l Skimmer), H&S 110-F1000 (1000l Sulphur/Nitrate Filter), H&S 150-F2000IA (800l Calcium Reactor)

Coralife 3X (UV Steriliser), I-Aquatic IF 312 (Fluidised Reactor), Kent Kalk Delivery, Resun CL650, Pinpoint ORP & PH Meters & Wireless Thermometer

4x2x2 Tank Thread

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