pH	pond
1	7.68	1
2	7.69	1
3	7.7	1
4	7.7	1
5	7.72	1
6	7.73	1
7	7.73	1
8	7.76	1
9	7.71	2
10	7.73	2
11	7.74	2
12	7.74	2
13	7.78	2
14	7.78	2
15	7.8	2
16	7.81	2
17	7.74	3
18	7.75	3
19	7.77	3
20	7.78	3
21	7.8	3
22	7.81	3
23	7.84	3
24	7.71	4
25	7.71	4
26	7.74	4
27	7.79	4
28	7.81	4
29	7.85	4
30	7.87	4
31	7.91	4