Readings:

Time: 0825
Inside Temp: 65 deg F / 18 deg C
Outside Temp: 56 deg F / 13 deg C
Relative Humidity: 65%

Time: 1230
Inside Temp: 71 deg F / 22 deg C
Outside Temp: 58 deg F / 14 deg C
Relative Humidity: 65%

Time: 1820
Inside Temp: 68 deg F / 20 deg C
Outside Temp: 48 deg F / 9 deg C
Relative Humidity: 69%

Maximum Temp: unreliable reading
Minimum Temp: unreliable reading
(Note: Temperature readings were taken in Fahrenheit)

Normal chores in the GreenHab were performed on each of these occasions.

• Both aerators are working, one is in Tank #2 and one in Tank #4.
• Only air bubbles in Tank #2 & 4
• All plants were sprayed with water and fed.
• The sump pump is connected to a timer which activates the system at 12:00 hours and 00:00 hours.
• The TST tank is still being filled as required by the pump; however, a float switch will be tested and installed in the coming days.
• Water level in the plant buckets is 6cm from the top in the white bucket and 7 cm from the top in the orange bucket.
• Water in tank #5 is higher ~10cm below highest salt line at 12:00. Today there was a small flow between some of the tanks as the crew is using more water.

Additional Chores:

• Estimating grey water usage (shower ~2.5 gallons for our crew, 5 gallons per washing dishes once per day [max 10 gallons if really dirty], washing hands 8 to 16 ounces per wash]; based on showers last night the estimates appear valid.
  
  
• Toilet Supply Tank (TST) work - Diaphragm pump
  Observation: the diaphragm pump is cycling less frequently every 8 seconds OFF and 2 seconds ON
  Actions: Removed the pump from in-line for diagnosis. We could not find a replacement pump. Therefore, a valved gravity feed system was installed. On the initial test of the system it did not appear to work. Therefore we removed the float arm cover in the toilet tank and found it clogged. The clog was removed and water starting coming out quickly. The gravity feed system will work on demand from the toilet with the valve in the ON position. This change requires no power and no monitoring, except to check for clogs in the toilet tank.
  Important Note: With the high amount of algae in the system and no filters, the particle buildup will impede the toilet refilling. This might have led to the problems with the diaphragm pump.
  
  
• TST work - Water Filters
  Observation: No water filters were found installed.
  Actions: Installed a 5 micron water filter; however, based on the flowrate it was determined that the 1 micron filter should not be installed or it might stall/break the pump which pushes water from Tank #5 to the TST.
  Important Note: With the high amount of algae in the system and no filters, the particle buildup will impede the toilet refilling. Therefore at least a 5 micron filter needs to be in-line.
  
  
• TST work - Float Switch
  Observation: we found what looked like a nonfunctioning old float sensor already installed.
  Action: We reviewed the procedures for installing the float switch, but decided to put it on hold to address the more pressing concern of the pump. However, we did take a picture of the TST's existing wiring which includes some sort of fluid sensor. We will ask mission support about it's status. Also notify Gary Fisher that we found a fluid switch but could not find the one specified in the directions.
  Proposed Action: Test existing fluid level sensor tomorrow. If it doesn't work install the new float switch if approved by mission support.
  
  
• Evaporation Test begun yesterday to document water loss from the treatment tanks as part of the grey water system balance. I used a 2000 ml Pyrex beaker with a 4.75 inch diameter.
  
  Beaker Surface Area: 11.04 sq inch
  03/31/04 15:32 1400 ml
  04/01/04 15:30 1350 ml
  
  Tank Surface Area: 1057.5 sq inch per tank
  Estimated water loss per Tank: 4789 ml / day
  Estimated water loss for 5 Tanks: ~24L /day (~6.34 G/day)

Open Issues:

• Electrical Diagram of the Greenhab
  Action: We tried to map the wiring of the Greenhab but this proved to be quite difficult. We have saved our initial draft as a Powerpoint slide so that it can be updated or corrected as necessary. This file will be uploaded to our Crew 27 directory along with\ other relevant procedures.
  
  
• Tacking down loose wires
  Action: In trying to shut off the aerators to staple the leads securely we found we could not turn them off. They are not routed through the Greenhab fuse box and shutting off circuits 5, 6, 8, 14, 16 and 20 in the hab had no effect.
  
  
• South Fan: "Hab power"
  Action: tested circuit breakers in the hab and found that it is connected to circuit breaker #16.
  
  
• The Southern louvers need to open more for proper ventilation.
  Action: Verify available solar panels
  
  
• HOBO logger system still not operating.
  Action: still waiting for email from Onsite
  
  
• Treatment system appears not to be removing nitrate.
  Actions: 1) Requested Water Hyacinths; 2) requested to reinnoculate system from the underground 110 gallon tank